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-rw-r--r--malloc/malloc.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/malloc/malloc.c b/malloc/malloc.c
index 5636d5c..4db4051 100644
--- a/malloc/malloc.c
+++ b/malloc/malloc.c
@@ -4201,6 +4201,13 @@ _int_free(mstate av, Void_t* mem)
set_fastchunks(av);
fb = &(av->fastbins[fastbin_index(size)]);
+ /* Another simple check: make sure the top of the bin is not the
+ record we are going to add (i.e., double free). */
+ if (__builtin_expect (*fb == p, 0))
+ {
+ malloc_printf_nc (check_action, "double free(%p)!\n", mem);
+ return;
+ }
p->fd = *fb;
*fb = p;
}