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Commit 0f2ddca6 authored by From: Thiemo Nagel's avatar From: Thiemo Nagel Committed by Theodore Ts'o
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ext4: check block device size on mount 



Signed-off-by: default avatarThiemo Nagel <thiemo.nagel@ph.tum.de>
Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
parent e44543b8

fs/ext4/super.c

+9 −0
Original line number Diff line number Diff line
@@ -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.