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ext4: check block device size on mount

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Signed-off-by: Thiemo Nagel <thiemo.nagel@ph.tum.de>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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From: Thiemo Nagel 2009-04-07 14:07:47 -04:00 committed by Theodore Ts'o
parent e44543b83b
commit 0f2ddca66d
1 changed files with 9 additions and 0 deletions
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9
fs/ext4/super.c
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@ -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.