linux-kernel - [ 09/26] ext4: add check for inodes_count overflow in new resize ioctl

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Date:	Thu,  9 May 2013 15:34:23 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Eric Sandeen <sandeen@...hat.com>,
	"Theodore Tso" <tytso@....edu>,
	Carlos Maiolino <cmaiolino@...hat.com>,
	Lingzhu Xiang <lxiang@...hat.com>
Subject: [ 09/26] ext4: add check for inodes_count overflow in new resize ioctl

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

------------------

From: Theodore Ts'o <tytso@....edu>

commit 3f8a6411fbada1fa482276591e037f3b1adcf55b upstream.

Addresses-Red-Hat-Bugzilla: #913245

Reported-by: Eric Sandeen <sandeen@...hat.com>
Signed-off-by: "Theodore Ts'o" <tytso@....edu>
Reviewed-by: Carlos Maiolino <cmaiolino@...hat.com>
Signed-off-by: Lingzhu Xiang <lxiang@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/ext4/resize.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/fs/ext4/resize.c
+++ b/fs/ext4/resize.c
@@ -1630,6 +1630,10 @@ int ext4_resize_fs(struct super_block *s
 		return 0;
 
 	ext4_get_group_no_and_offset(sb, n_blocks_count - 1, &n_group, &offset);
+	if (n_group > (0xFFFFFFFFUL / EXT4_INODES_PER_GROUP(sb))) {
+		ext4_warning(sb, "resize would cause inodes_count overflow");
+		return -EINVAL;
+	}
 	ext4_get_group_no_and_offset(sb, o_blocks_count - 1, &o_group, &offset);
 
 	n_desc_blocks = (n_group + EXT4_DESC_PER_BLOCK(sb)) /


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