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sd-resolve: check that name fits in the specified packet length

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Coverity complained that we didn't check if the data is long enough.
This commit is contained in:
Zbigniew Jędrzejewski-Szmek 2017-11-27 13:54:55 +00:00
parent 8d44f5a637
commit 1a96c8e1cc
1 changed files with 28 additions and 16 deletions
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44
src/libsystemd/sd-resolve/sd-resolve.c
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@ -33,6 +33,7 @@
#include "sd-resolve.h"
#include "alloc-util.h"
#include "dns-domain.h"
#include "fd-util.h"
#include "io-util.h"
#include "list.h"
@ -812,25 +813,36 @@ static int handle_response(sd_resolve *resolve, const Packet *packet, size_t len
assert(length >= sizeof(NameInfoResponse));
assert(q->type == REQUEST_NAMEINFO);
q->ret = ni_resp->ret;
q->_errno = ni_resp->_errno;
q->_h_errno = ni_resp->_h_errno;
if (ni_resp->hostlen > DNS_HOSTNAME_MAX ||
ni_resp->servlen > DNS_HOSTNAME_MAX ||
sizeof(NameInfoResponse) + ni_resp->hostlen + ni_resp->servlen > length + 2) {
q->ret = EAI_SYSTEM;
q->_errno = -EIO;
q->_h_errno = 0;
if (ni_resp->hostlen > 0) {
q->host = strndup((const char*) ni_resp + sizeof(NameInfoResponse), ni_resp->hostlen-1);
if (!q->host) {
q->ret = EAI_MEMORY;
q->_errno = ENOMEM;
q->_h_errno = 0;
} else {
q->ret = ni_resp->ret;
q->_errno = ni_resp->_errno;
q->_h_errno = ni_resp->_h_errno;
if (ni_resp->hostlen > 0) {
q->host = strndup((const char*) ni_resp + sizeof(NameInfoResponse),
ni_resp->hostlen-1);
if (!q->host) {
q->ret = EAI_MEMORY;
q->_errno = ENOMEM;
q->_h_errno = 0;
}
}
}
if (ni_resp->servlen > 0) {
q->serv = strndup((const char*) ni_resp + sizeof(NameInfoResponse) + ni_resp->hostlen, ni_resp->servlen-1);
if (!q->serv) {
q->ret = EAI_MEMORY;
q->_errno = ENOMEM;
q->_h_errno = 0;
if (ni_resp->servlen > 0) {
q->serv = strndup((const char*) ni_resp + sizeof(NameInfoResponse) + ni_resp->hostlen,
ni_resp->servlen-1);
if (!q->serv) {
q->ret = EAI_MEMORY;
q->_errno = ENOMEM;
q->_h_errno = 0;
}
}
}