From: Theodore Ts'o Subject: [PATCH] ext4: add check for inodes_count overflow in new resize ioctl Date: Sun, 21 Apr 2013 22:57:05 -0400 Message-ID: <1366599425-11561-1-git-send-email-tytso@mit.edu> Cc: Theodore Ts'o , stable@vger.kernel.org To: Ext4 Developers List Return-path: Sender: stable-owner@vger.kernel.org List-Id: linux-ext4.vger.kernel.org Addresses-Red-Hat-Bugzilla: #913245 Reported-by: Eric Sandeen Signed-off-by: "Theodore Ts'o" Cc: stable@vger.kernel.org --- fs/ext4/resize.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c index 08d2312..b27c96d 100644 --- a/fs/ext4/resize.c +++ b/fs/ext4/resize.c @@ -1882,6 +1882,10 @@ retry: return 0; n_group = ext4_get_group_number(sb, n_blocks_count - 1); + 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 = num_desc_blocks(sb, n_group + 1); -- 1.7.12.rc0.22.gcdd159b