bfs: check that filesystem fits on the blockdevice
Since all sanity checks rely on the validity of s_start which gets only checked to be smaller than s_end, we should also check if s_end is sane. Now we also try to retrieve the last block of the filesystem, which is computed by s_end. If this fails, something is bogus. Signed-off-by: Eric Sesterhenn <snakebyte@gmx.de> Acked-by: Tigran Aivazian <tigran@aivazian.fsnet.co.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -390,6 +390,18 @@ static int bfs_fill_super(struct super_block *s, void *data, int silent)
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- le32_to_cpu(bfs_sb->s_start)) >> BFS_BSIZE_BITS;
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info->si_freei = 0;
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info->si_lf_eblk = 0;
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/* can we read the last block? */
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bh = sb_bread(s, info->si_blocks - 1);
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if (!bh) {
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printf("Last block not available: %lu\n", info->si_blocks - 1);
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iput(inode);
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ret = -EIO;
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kfree(info->si_imap);
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goto out;
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}
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brelse(bh);
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bh = NULL;
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for (i = BFS_ROOT_INO; i <= info->si_lasti; i++) {
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struct bfs_inode *di;
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