ext4: fix potential NULL dereference in ext4_free_inodes_counts()
authorDan Carpenter <dan.carpenter@oracle.com>
Mon, 28 May 2012 18:16:57 +0000 (14:16 -0400)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Sat, 9 Jun 2012 15:36:15 +0000 (00:36 +0900)
commit2c693b1d2fd1789a8b52f3644d41547b1ba9a26e
tree145a3893edbde6a3b87beb5b1699f7012784530e
parent978041f2a946a4616f7cdb60f6d453ffa83298c1
ext4: fix potential NULL dereference in ext4_free_inodes_counts()

commit bb3d132a24cd8bf5e7773b2d9f9baa58b07a7dae upstream.

The ext4_get_group_desc() function returns NULL on error, and
ext4_free_inodes_count() function dereferences it without checking.
There is a check on the next line, but it's too late.

Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
fs/ext4/ialloc.c