File bsc-1206791-08-lib-lru_cache-Fixed-array-overfl... of Package drbd

Overview Repositories Revisions Requests Users Attributes Meta

File bsc-1206791-08-lib-lru_cache-Fixed-array-overflow-caused-by-incorre.patch of Package drbd (Revision 68a49a48ce657d61c564d3bf30e3ef71)

Currently displaying revision 68a49a48ce657d61c564d3bf30e3ef71 , Show latest

From c2a620949ed609d6e256d1ce4d671a6da6bfeac0 Mon Sep 17 00:00:00 2001
From: John Sanpe <sanpeqf@gmail.com>
Date: Sat, 23 Jul 2022 09:59:31 +0200
Subject: [PATCH] lib/lru_cache: Fixed array overflow caused by incorrect
 boundary handling.
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

This problem occurs when malloc element failed on the first time.
At this time, the counter i is 0. When it's released, we subtract 1
in advance without checking, which will cause i to become UINT_MAX,
resulting in array overflow.

Signed-off-by: John Sanpe <sanpeqf@gmail.com>
Reviewed-by: Christoph Böhmwalder <christoph.boehmwalder@linbit.com>
---
 drbd/lru_cache.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drbd/lru_cache.c b/drbd/lru_cache.c
index 7e604cdc87db..fc640490607a 100644
--- a/drbd/lru_cache.c
+++ b/drbd/lru_cache.c
@@ -127,7 +127,7 @@ struct lru_cache *lc_create(const char *name, struct kmem_cache *cache,
 		return lc;
 
 	/* else: could not allocate all elements, give up */
-	for (i--; i; i--) {
+	while (i--) {
 		void *p = element[i];
 		kmem_cache_free(cache, (unsigned char *)p - e_off);
 	}
-- 
2.26.2

Places

File bsc-1206791-08-lib-lru_cache-Fixed-array-overflow-caused-by-incorre.patch of Package drbd (Revision 68a49a48ce657d61c564d3bf30e3ef71)

Places