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https://gitlab.gnome.org/GNOME/libxml2.git
synced 2024-10-26 20:25:14 +03:00
Fix parser local buffers size problems
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parent
740cb1a450
commit
459eeb9dc7
74
parser.c
74
parser.c
@ -40,6 +40,7 @@
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#endif
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#include <stdlib.h>
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#include <limits.h>
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#include <string.h>
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#include <stdarg.h>
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#include <libxml/xmlmemory.h>
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@ -117,10 +118,10 @@ xmlCreateEntityParserCtxtInternal(const xmlChar *URL, const xmlChar *ID,
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* parser option.
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*/
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static int
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xmlParserEntityCheck(xmlParserCtxtPtr ctxt, unsigned long size,
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xmlParserEntityCheck(xmlParserCtxtPtr ctxt, size_t size,
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xmlEntityPtr ent)
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{
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unsigned long consumed = 0;
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size_t consumed = 0;
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if ((ctxt == NULL) || (ctxt->options & XML_PARSE_HUGE))
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return (0);
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@ -2589,15 +2590,17 @@ xmlParserHandlePEReference(xmlParserCtxtPtr ctxt) {
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/*
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* Macro used to grow the current buffer.
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* buffer##_size is expected to be a size_t
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* mem_error: is expected to handle memory allocation failures
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*/
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#define growBuffer(buffer, n) { \
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xmlChar *tmp; \
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buffer##_size *= 2; \
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buffer##_size += n; \
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tmp = (xmlChar *) \
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xmlRealloc(buffer, buffer##_size * sizeof(xmlChar)); \
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size_t new_size = buffer##_size * 2 + n; \
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if (new_size < buffer##_size) goto mem_error; \
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tmp = (xmlChar *) xmlRealloc(buffer, new_size); \
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if (tmp == NULL) goto mem_error; \
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buffer = tmp; \
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buffer##_size = new_size; \
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}
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/**
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@ -2623,14 +2626,14 @@ xmlChar *
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xmlStringLenDecodeEntities(xmlParserCtxtPtr ctxt, const xmlChar *str, int len,
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int what, xmlChar end, xmlChar end2, xmlChar end3) {
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xmlChar *buffer = NULL;
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int buffer_size = 0;
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size_t buffer_size = 0;
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size_t nbchars = 0;
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xmlChar *current = NULL;
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xmlChar *rep = NULL;
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const xmlChar *last;
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xmlEntityPtr ent;
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int c,l;
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int nbchars = 0;
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if ((ctxt == NULL) || (str == NULL) || (len < 0))
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return(NULL);
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@ -2647,7 +2650,7 @@ xmlStringLenDecodeEntities(xmlParserCtxtPtr ctxt, const xmlChar *str, int len,
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* allocate a translation buffer.
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*/
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buffer_size = XML_PARSER_BIG_BUFFER_SIZE;
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buffer = (xmlChar *) xmlMallocAtomic(buffer_size * sizeof(xmlChar));
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buffer = (xmlChar *) xmlMallocAtomic(buffer_size);
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if (buffer == NULL) goto mem_error;
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/*
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@ -2667,7 +2670,7 @@ xmlStringLenDecodeEntities(xmlParserCtxtPtr ctxt, const xmlChar *str, int len,
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if (val != 0) {
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COPY_BUF(0,buffer,nbchars,val);
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}
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if (nbchars > buffer_size - XML_PARSER_BUFFER_SIZE) {
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if (nbchars + XML_PARSER_BUFFER_SIZE > buffer_size) {
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growBuffer(buffer, XML_PARSER_BUFFER_SIZE);
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}
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} else if ((c == '&') && (what & XML_SUBSTITUTE_REF)) {
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@ -2685,7 +2688,7 @@ xmlStringLenDecodeEntities(xmlParserCtxtPtr ctxt, const xmlChar *str, int len,
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(ent->etype == XML_INTERNAL_PREDEFINED_ENTITY)) {
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if (ent->content != NULL) {
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COPY_BUF(0,buffer,nbchars,ent->content[0]);
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if (nbchars > buffer_size - XML_PARSER_BUFFER_SIZE) {
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if (nbchars + XML_PARSER_BUFFER_SIZE > buffer_size) {
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growBuffer(buffer, XML_PARSER_BUFFER_SIZE);
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}
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} else {
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@ -2702,8 +2705,7 @@ xmlStringLenDecodeEntities(xmlParserCtxtPtr ctxt, const xmlChar *str, int len,
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current = rep;
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while (*current != 0) { /* non input consuming loop */
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buffer[nbchars++] = *current++;
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if (nbchars >
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buffer_size - XML_PARSER_BUFFER_SIZE) {
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if (nbchars + XML_PARSER_BUFFER_SIZE > buffer_size) {
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if (xmlParserEntityCheck(ctxt, nbchars, ent))
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goto int_error;
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growBuffer(buffer, XML_PARSER_BUFFER_SIZE);
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@ -2717,7 +2719,7 @@ xmlStringLenDecodeEntities(xmlParserCtxtPtr ctxt, const xmlChar *str, int len,
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const xmlChar *cur = ent->name;
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buffer[nbchars++] = '&';
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if (nbchars > buffer_size - i - XML_PARSER_BUFFER_SIZE) {
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if (nbchars + i + XML_PARSER_BUFFER_SIZE > buffer_size) {
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growBuffer(buffer, i + XML_PARSER_BUFFER_SIZE);
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}
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for (;i > 0;i--)
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@ -2745,8 +2747,7 @@ xmlStringLenDecodeEntities(xmlParserCtxtPtr ctxt, const xmlChar *str, int len,
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current = rep;
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while (*current != 0) { /* non input consuming loop */
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buffer[nbchars++] = *current++;
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if (nbchars >
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buffer_size - XML_PARSER_BUFFER_SIZE) {
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if (nbchars + XML_PARSER_BUFFER_SIZE > buffer_size) {
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if (xmlParserEntityCheck(ctxt, nbchars, ent))
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goto int_error;
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growBuffer(buffer, XML_PARSER_BUFFER_SIZE);
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@ -2759,8 +2760,8 @@ xmlStringLenDecodeEntities(xmlParserCtxtPtr ctxt, const xmlChar *str, int len,
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} else {
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COPY_BUF(l,buffer,nbchars,c);
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str += l;
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if (nbchars > buffer_size - XML_PARSER_BUFFER_SIZE) {
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growBuffer(buffer, XML_PARSER_BUFFER_SIZE);
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if (nbchars + XML_PARSER_BUFFER_SIZE > buffer_size) {
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growBuffer(buffer, XML_PARSER_BUFFER_SIZE);
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}
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}
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if (str < last)
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@ -3764,8 +3765,8 @@ xmlParseAttValueComplex(xmlParserCtxtPtr ctxt, int *attlen, int normalize) {
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xmlChar limit = 0;
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xmlChar *buf = NULL;
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xmlChar *rep = NULL;
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int len = 0;
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int buf_size = 0;
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size_t len = 0;
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size_t buf_size = 0;
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int c, l, in_space = 0;
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xmlChar *current = NULL;
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xmlEntityPtr ent;
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@ -3787,7 +3788,7 @@ xmlParseAttValueComplex(xmlParserCtxtPtr ctxt, int *attlen, int normalize) {
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* allocate a translation buffer.
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*/
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buf_size = XML_PARSER_BUFFER_SIZE;
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buf = (xmlChar *) xmlMallocAtomic(buf_size * sizeof(xmlChar));
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buf = (xmlChar *) xmlMallocAtomic(buf_size);
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if (buf == NULL) goto mem_error;
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/*
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@ -3804,7 +3805,7 @@ xmlParseAttValueComplex(xmlParserCtxtPtr ctxt, int *attlen, int normalize) {
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if (val == '&') {
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if (ctxt->replaceEntities) {
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if (len > buf_size - 10) {
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if (len + 10 > buf_size) {
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growBuffer(buf, 10);
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}
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buf[len++] = '&';
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@ -3813,7 +3814,7 @@ xmlParseAttValueComplex(xmlParserCtxtPtr ctxt, int *attlen, int normalize) {
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* The reparsing will be done in xmlStringGetNodeList()
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* called by the attribute() function in SAX.c
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*/
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if (len > buf_size - 10) {
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if (len + 10 > buf_size) {
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growBuffer(buf, 10);
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}
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buf[len++] = '&';
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@ -3823,7 +3824,7 @@ xmlParseAttValueComplex(xmlParserCtxtPtr ctxt, int *attlen, int normalize) {
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buf[len++] = ';';
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}
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} else if (val != 0) {
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if (len > buf_size - 10) {
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if (len + 10 > buf_size) {
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growBuffer(buf, 10);
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}
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len += xmlCopyChar(0, &buf[len], val);
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@ -3835,7 +3836,7 @@ xmlParseAttValueComplex(xmlParserCtxtPtr ctxt, int *attlen, int normalize) {
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ctxt->nbentities += ent->owner;
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if ((ent != NULL) &&
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(ent->etype == XML_INTERNAL_PREDEFINED_ENTITY)) {
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if (len > buf_size - 10) {
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if (len + 10 > buf_size) {
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growBuffer(buf, 10);
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}
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if ((ctxt->replaceEntities == 0) &&
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@ -3863,7 +3864,7 @@ xmlParseAttValueComplex(xmlParserCtxtPtr ctxt, int *attlen, int normalize) {
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current++;
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} else
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buf[len++] = *current++;
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if (len > buf_size - 10) {
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if (len + 10 > buf_size) {
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growBuffer(buf, 10);
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}
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}
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@ -3871,7 +3872,7 @@ xmlParseAttValueComplex(xmlParserCtxtPtr ctxt, int *attlen, int normalize) {
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rep = NULL;
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}
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} else {
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if (len > buf_size - 10) {
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if (len + 10 > buf_size) {
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growBuffer(buf, 10);
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}
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if (ent->content != NULL)
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@ -3899,7 +3900,7 @@ xmlParseAttValueComplex(xmlParserCtxtPtr ctxt, int *attlen, int normalize) {
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* Just output the reference
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*/
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buf[len++] = '&';
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while (len > buf_size - i - 10) {
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while (len + i + 10 > buf_size) {
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growBuffer(buf, i + 10);
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}
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for (;i > 0;i--)
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@ -3912,7 +3913,7 @@ xmlParseAttValueComplex(xmlParserCtxtPtr ctxt, int *attlen, int normalize) {
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if ((len != 0) || (!normalize)) {
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if ((!normalize) || (!in_space)) {
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COPY_BUF(l,buf,len,0x20);
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while (len > buf_size - 10) {
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while (len + 10 > buf_size) {
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growBuffer(buf, 10);
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}
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}
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@ -3921,7 +3922,7 @@ xmlParseAttValueComplex(xmlParserCtxtPtr ctxt, int *attlen, int normalize) {
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} else {
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in_space = 0;
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COPY_BUF(l,buf,len,c);
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if (len > buf_size - 10) {
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if (len + 10 > buf_size) {
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growBuffer(buf, 10);
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}
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}
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@ -3946,7 +3947,18 @@ xmlParseAttValueComplex(xmlParserCtxtPtr ctxt, int *attlen, int normalize) {
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}
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} else
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NEXT;
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if (attlen != NULL) *attlen = len;
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/*
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* There we potentially risk an overflow, don't allow attribute value of
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* lenght more than INT_MAX it is a very reasonnable assumption !
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*/
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if (len >= INT_MAX) {
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xmlFatalErrMsg(ctxt, XML_ERR_ATTRIBUTE_NOT_FINISHED,
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"AttValue lenght too long\n");
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goto mem_error;
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}
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if (attlen != NULL) *attlen = (int) len;
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return(buf);
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mem_error:
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