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malloc: additional unlink hardening for non-small bins [BZ #17344]

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Turn two asserts into a conditional call to malloc_printerr.  The
memory locations are accessed later anyway, so the performance
impact is minor.
This commit is contained in:
Florian Weimer
2014-09-10 20:29:15 +02:00
parent 984c0ea97f
commit 52ffbdf25a
3 changed files with 11 additions and 3 deletions
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6
malloc/malloc.c
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@@ -1418,8 +1418,10 @@ typedef struct malloc_chunk *mbinptr;
BK->fd = FD; \
if (!in_smallbin_range (P->size) \
&& __builtin_expect (P->fd_nextsize != NULL, 0)) { \
assert (P->fd_nextsize->bk_nextsize == P); \
assert (P->bk_nextsize->fd_nextsize == P); \
if (__builtin_expect (P->fd_nextsize->bk_nextsize != P, 0) \
|| __builtin_expect (P->bk_nextsize->fd_nextsize != P, 0)) \
malloc_printerr (check_action, \
"corrupted double-linked list (not small)", P);\
if (FD->fd_nextsize == NULL) { \
if (P->fd_nextsize == P) \
FD->fd_nextsize = FD->bk_nextsize = FD; \