From a52ef8e41670776f6d3e0acc264a37a366696741 Mon Sep 17 00:00:00 2001
From: Jakub Jelinek <jakub@redhat.com>
Date: Mon, 15 Nov 2004 09:49:06 +0000
Subject: 	* malloc/malloc.c (_int_free): Further free () protection
 checks.

---
 malloc/malloc.c | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'malloc')

diff --git a/malloc/malloc.c b/malloc/malloc.c
index 57074108f1..f4612046cd 100644
--- a/malloc/malloc.c
+++ b/malloc/malloc.c
@@ -4233,6 +4233,14 @@ _int_free(mstate av, Void_t* mem)
 #endif
       ) {
 
+    if (__builtin_expect (chunksize (chunk_at_offset (p, size)) < MINSIZE, 0)
+	|| __builtin_expect (chunksize (chunk_at_offset (p, size))
+			     >= av->system_mem, 0))
+      {
+	errstr = "invalid next size (fast)";
+	goto errout;
+      }
+
     set_fastchunks(av);
     fb = &(av->fastbins[fastbin_index(size)]);
     /* Another simple check: make sure the top of the bin is not the
-- 
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