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authorBob Copeland <me@bobcopeland.com>2008-08-14 18:43:59 -0400
committerBob Copeland <me@bobcopeland.com>2010-07-10 14:37:39 -0400
commit9442e54f433eff9b6fbd0836611df4c1919df370 (patch)
tree5740987b7a7fcb1511263435fbbf48cf15ff0814
parentf068272cb2f134a194b93e94a8e0672bfce48cd8 (diff)
downloadop-kernel-dev-9442e54f433eff9b6fbd0836611df4c1919df370.zip
op-kernel-dev-9442e54f433eff9b6fbd0836611df4c1919df370.tar.gz
omfs: refuse to mount if bitmap pointer is obviously wrong
If the free space bitmap pointer is corrupted such that it lies outside of the number of blocks in the filesystem, print a message and fail the mount so the user can fix it offline. Signed-off-by: Bob Copeland <me@bobcopeland.com>
-rw-r--r--fs/omfs/inode.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/fs/omfs/inode.c b/fs/omfs/inode.c
index bd4bf75..0af5d0a 100644
--- a/fs/omfs/inode.c
+++ b/fs/omfs/inode.c
@@ -509,6 +509,15 @@ static int omfs_fill_super(struct super_block *sb, void *data, int silent)
goto out_brelse_bh2;
}
+ if (sbi->s_bitmap_ino != ~0ULL &&
+ sbi->s_bitmap_ino > sbi->s_num_blocks) {
+ printk(KERN_ERR "omfs: free space bitmap location is corrupt "
+ "(%llx, total blocks %llx)\n",
+ (unsigned long long) sbi->s_bitmap_ino,
+ (unsigned long long) sbi->s_num_blocks);
+ goto out_brelse_bh2;
+ }
+
ret = omfs_get_imap(sb);
if (ret)
goto out_brelse_bh2;
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