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Add recursion depth protection to LIKE matching.

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Since MatchText() recurses, it could in principle be driven to stack
overflow, although quite a long pattern would be needed.
This commit is contained in:
Tom Lane
2015-10-02 15:00:52 -04:00
parent e7de1bc097
commit f80af01174
2 changed files with 4 additions and 0 deletions
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1
src/backend/utils/adt/like.c
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@@ -21,6 +21,7 @@
#include "catalog/pg_collation.h" #include "catalog/pg_collation.h"
#include "mb/pg_wchar.h" #include "mb/pg_wchar.h"
#include "miscadmin.h"
#include "utils/builtins.h" #include "utils/builtins.h"
#include "utils/pg_locale.h" #include "utils/pg_locale.h"

3
src/backend/utils/adt/like_match.c
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@@ -83,6 +83,9 @@ MatchText(char *t, int tlen, char *p, int plen,
if (plen == 1 && *p == '%') if (plen == 1 && *p == '%')
return LIKE_TRUE; return LIKE_TRUE;
/* Since this function recurses, it could be driven to stack overflow */
check_stack_depth();
/* /*
* In this loop, we advance by char when matching wildcards (and thus on * In this loop, we advance by char when matching wildcards (and thus on
* recursive entry to this function we are properly char-synced). On other * recursive entry to this function we are properly char-synced). On other