linux-kernel - [PATCH] lib/lru_cache: Fix error free handing in lc

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Date:   Sat, 18 Jun 2022 16:25:21 +0800
From:   wuchi <wuchi.zero@...il.com>
To:     philipp.reisner@...bit.com, lars.ellenberg@...bit.com,
        christoph.boehmwalder@...bit.com
Cc:     akpm@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: [PATCH] lib/lru_cache: Fix error free handing in lc_create.

When kmem_cache_alloc in function lc_create returns null, we will
free the memory already allocated. The loop of kmem_cache_free
is wrong, especially:
  i = 0  ==> do wrong loop
  i > 0  ==> do not free element[0]

Signed-off-by: wuchi <wuchi.zero@...il.com>
---
 lib/lru_cache.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/lru_cache.c b/lib/lru_cache.c
index 52313acbfa62..dc35464216d3 100644
--- a/lib/lru_cache.c
+++ b/lib/lru_cache.c
@@ -147,8 +147,8 @@ 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--) {
-		void *p = element[i];
+	while (i) {
+		void *p = element[--i];
 		kmem_cache_free(cache, p - e_off);
 	}
 	kfree(lc);
-- 
2.20.1