[PATCH] malloc: Print error when oldsize is not equal to the current size.

[liqingqing]

 This is used to detect errors early.

---
 malloc/malloc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/malloc/malloc.c b/malloc/malloc.c
index 530c792997..243be0da68 100644
--- a/malloc/malloc.c
+++ b/malloc/malloc.c
@@ -4784,7 +4784,8 @@ _int_realloc(mstate av, mchunkptr oldp, INTERNAL_SIZE_T oldsize,
 
   /* oldmem size */
   if (__builtin_expect (chunksize_nomask (oldp) <= CHUNK_HDR_SZ, 0)
-      || __builtin_expect (oldsize >= av->system_mem, 0))
+      || __builtin_expect (oldsize >= av->system_mem, 0)
+      || __builtin_expect (oldsize != chunksize (oldp), 0))
     malloc_printerr ("realloc(): invalid old size");
 
   check_inuse_chunk (av, oldp);
-- 
2.27.0