linux-ext4 - [PATCH] ext2: add additinal sanity check for ext2_acl_from

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Message-Id: <20180902153100.4480-1-cgxu519@gmx.com>
Date:   Sun,  2 Sep 2018 23:31:00 +0800
From:   Chengguang Xu <cgxu519@....com>
To:     jack@...e.com
Cc:     linux-ext4@...r.kernel.org, Chengguang Xu <cgxu519@....com>
Subject: [PATCH] ext2: add additinal sanity check for ext2_acl_from_disk()

In the case ACL_USER and ACL_GROUP we check if value has exceeded end,
add same check in the case ACL_OTHER as well.

Signed-off-by: Chengguang Xu <cgxu519@....com>
---
 fs/ext2/acl.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/ext2/acl.c b/fs/ext2/acl.c
index 224c04abb2e5..3082d93f1cb1 100644
--- a/fs/ext2/acl.c
+++ b/fs/ext2/acl.c
@@ -53,6 +53,8 @@ ext2_acl_from_disk(const void *value, size_t size)
 			case ACL_OTHER:
 				value = (char *)value +
 					sizeof(ext2_acl_entry_short);
+				if ((char *)value > end)
+					goto fail;
 				break;
 
 			case ACL_USER:
-- 
2.17.1