From 0f2ddca66d70c8ccba7486cf2d79c6b60e777abd Mon Sep 17 00:00:00 2001 From: "From: Thiemo Nagel" Date: Tue, 7 Apr 2009 14:07:47 -0400 Subject: [PATCH] ext4: check block device size on mount Signed-off-by: Thiemo Nagel Signed-off-by: "Theodore Ts'o" --- fs/ext4/super.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 9987bba99db3..2958f4e6f222 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -2508,6 +2508,15 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent) if (EXT4_BLOCKS_PER_GROUP(sb) == 0) goto cantfind_ext4; + /* check blocks count against device size */ + blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits; + if (blocks_count && ext4_blocks_count(es) > blocks_count) { + printk(KERN_WARNING "EXT4-fs: bad geometry: block count %llu " + "exceeds size of device (%llu blocks)\n", + ext4_blocks_count(es), blocks_count); + goto failed_mount; + } + /* * It makes no sense for the first data block to be beyond the end * of the filesystem. -- 2.34.1