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schemas: Fix infinite loop in xmlSchemaCheckElemSubstGroup

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Types like xmlSchemaTypeAnyTypeDef have a base type pointing to itself,
resulting in an infinite loop.

Fixes #430.
This commit is contained in:
Nick Wellnhofer 2022-11-02 10:53:24 +01:00
parent 9aba613b14
commit abb5a93fed
1 changed files with 2 additions and 1 deletions
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3
xmlschemas.c
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@ -19960,7 +19960,8 @@ xmlSchemaCheckElemSubstGroup(xmlSchemaParserCtxtPtr ctxt,
/*
* The set of all {derivation method}s involved in the derivation
*/
while ((type != NULL) && (type != headType)) {
while ((type != NULL) && (type != headType) &&
(type != type->baseType)) {
if ((WXS_IS_EXTENSION(type)) &&
((methSet & XML_SCHEMAS_TYPE_BLOCK_RESTRICTION) == 0))
methSet |= XML_SCHEMAS_TYPE_BLOCK_EXTENSION;