https://bugs.exim.org/show_bug.cgi?id=1758
Bug ID: 1758
Summary: pcre_stack_malloc/free are not called in a stack-like
manner
Product: PCRE
Version: 8.37
Hardware: x86
OS: Linux
Status: NEW
Severity: bug
Priority: medium
Component: Code
Assignee: ph10@???
Reporter: jay.foad@???
CC: pcre-dev@???
man pcreapi says:
> The global variables pcre_stack_malloc and pcre_stack_free are also
> indirections to memory management functions. These special functions are used
> only when PCRE is compiled to use the heap for remembering data, instead of
> recursive function calls, when running the pcre_exec() function. [...] When
> used, these functions are always called in a stack-like manner (last obtained,
> first freed)
In practice this is not true. pcre_stack_free is called from
release_match_heapframes (in pcre_exec.c) which runs through a linked list of
allocated frames, freeing them *least* recently allocated first.
This broke my app when upgrading from PCRE 8.12 to 8.37, because I have custom
pcre_stack_malloc/free functions that keep track of how many frames have been
allocated, and use a different strategy for allocating/freeing the first 100 vs
all the other ones.
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