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* malloc/malloc.c (_int_free): Add cheap test for some invalid
	block sizes.
This commit is contained in:
Ulrich Drepper 2003-08-19 09:30:22 +00:00
parent 75f2e0d109
commit 9a3a9dd8d9
2 changed files with 10 additions and 0 deletions
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ChangeLog
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@ -1,5 +1,8 @@
2003-08-19 Ulrich Drepper <drepper@redhat.com>
* malloc/malloc.c (_int_free): Add cheap test for some invalid
block sizes.
* sysdeps/unix/sysv/linux/i386/posix_fadvise64.S: Fix typo in
syscall name.

7
malloc/malloc.c
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@ -4131,6 +4131,13 @@ _int_free(mstate av, Void_t* mem)
p = mem2chunk(mem);
size = chunksize(p);
/* Little security check which won't hurt performance: the
allocator never wrapps around at the end of the address space.
Therefore we can exclude some size values which might appear
here by accident or by "design" from some intruder. */
if ((uintptr_t) p > (uintptr_t) -size)
return;
check_inuse_chunk(av, p);
/*