linux-kernel - [PATCH 3.12 085/142] ext4: fix potential integer overflow

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Message-Id: <b7993fb7ce48ca9ba2cfba6226c0f54db589fb9d.1456308281.git.jslaby@suse.cz>
Date:	Wed, 24 Feb 2016 11:04:40 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Insu Yun <wuninsu@...il.com>,
	Theodore Ts'o <tytso@....edu>, Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 085/142] ext4: fix potential integer overflow

From: Insu Yun <wuninsu@...il.com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 46901760b46064964b41015d00c140c83aa05bcf upstream.

Since sizeof(ext_new_group_data) > sizeof(ext_new_flex_group_data),
integer overflow could be happened.
Therefore, need to fix integer overflow sanitization.

Signed-off-by: Insu Yun <wuninsu@...il.com>
Signed-off-by: Theodore Ts'o <tytso@....edu>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 fs/ext4/resize.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c
index 831cb305c63f..ae8ce49c0437 100644
--- a/fs/ext4/resize.c
+++ b/fs/ext4/resize.c
@@ -186,7 +186,7 @@ static struct ext4_new_flex_group_data *alloc_flex_gd(unsigned long flexbg_size)
 	if (flex_gd == NULL)
 		goto out3;
 
-	if (flexbg_size >= UINT_MAX / sizeof(struct ext4_new_flex_group_data))
+	if (flexbg_size >= UINT_MAX / sizeof(struct ext4_new_group_data))
 		goto out2;
 	flex_gd->count = flexbg_size;
 
-- 
2.7.1