omfs: check bounds on block numbers before passing to sb_bread

In case of filesystem corruption, passing unchecked block numbers into
sb_bread can result in an infinite loop in __getblk().  Introduce a wrapper
function omfs_sbread() to check the block numbers and to also perform the
clus_to_blk() scaling.

Signed-off-by: Bob Copeland <me@bobcopeland.com>

fs/omfs/dir.c

@@ -25,11 +25,10 @@ static struct buffer_head *omfs_get_bucket(struct inode *dir,
 		const char *name, int namelen, int *ofs)
 {
 	int nbuckets = (dir->i_size - OMFS_DIR_START)/8;
-	int block = clus_to_blk(OMFS_SB(dir->i_sb), dir->i_ino);
 	int bucket = omfs_hash(name, namelen, nbuckets);
 
 	*ofs = OMFS_DIR_START + bucket * 8;
-	return sb_bread(dir->i_sb, block);
+	return omfs_bread(dir->i_sb, dir->i_ino);
 }
 
 static struct buffer_head *omfs_scan_list(struct inode *dir, u64 block,
@@ -42,8 +41,7 @@ static struct buffer_head *omfs_scan_list(struct inode *dir, u64 block,
 	*prev_block = ~0;
 
 	while (block != ~0) {
-		bh = sb_bread(dir->i_sb,
-			clus_to_blk(OMFS_SB(dir->i_sb), block));
+		bh = omfs_bread(dir->i_sb, block);
 		if (!bh) {
 			err = -EIO;
 			goto err;
@@ -86,11 +84,10 @@ static struct buffer_head *omfs_find_entry(struct inode *dir,
 int omfs_make_empty(struct inode *inode, struct super_block *sb)
 {
 	struct omfs_sb_info *sbi = OMFS_SB(sb);
-	int block = clus_to_blk(sbi, inode->i_ino);
 	struct buffer_head *bh;
 	struct omfs_inode *oi;
 
-	bh = sb_bread(sb, block);
+	bh = omfs_bread(sb, inode->i_ino);
 	if (!bh)
 		return -ENOMEM;
 
@@ -134,7 +131,7 @@ static int omfs_add_link(struct dentry *dentry, struct inode *inode)
 	brelse(bh);
 
 	/* now set the sibling and parent pointers on the new inode */
-	bh = sb_bread(dir->i_sb, clus_to_blk(OMFS_SB(dir->i_sb), inode->i_ino));
+	bh = omfs_bread(dir->i_sb, inode->i_ino);
 	if (!bh)
 		goto out;
 
@@ -190,8 +187,7 @@ static int omfs_delete_entry(struct dentry *dentry)
 	if (prev != ~0) {
 		/* found in middle of list, get list ptr */
 		brelse(bh);
-		bh = sb_bread(dir->i_sb,
-			clus_to_blk(OMFS_SB(dir->i_sb), prev));
+		bh = omfs_bread(dir->i_sb, prev);
 		if (!bh)
 			goto out;
 
@@ -224,8 +220,7 @@ static int omfs_dir_is_empty(struct inode *inode)
 	u64 *ptr;
 	int i;
 
-	bh = sb_bread(inode->i_sb, clus_to_blk(OMFS_SB(inode->i_sb),
-			inode->i_ino));
+	bh = omfs_bread(inode->i_sb, inode->i_ino);
 
 	if (!bh)
 		return 0;
@@ -353,8 +348,7 @@ static int omfs_fill_chain(struct file *filp, void *dirent, filldir_t filldir,
 
 	/* follow chain in this bucket */
 	while (fsblock != ~0) {
-		bh = sb_bread(dir->i_sb, clus_to_blk(OMFS_SB(dir->i_sb),
-				fsblock));
+		bh = omfs_bread(dir->i_sb, fsblock);
 		if (!bh)
 			goto out;
 
@@ -466,7 +460,7 @@ static int omfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
 	hchain = (filp->f_pos >> 20) - 1;
 	hindex = filp->f_pos & 0xfffff;
 
-	bh = sb_bread(dir->i_sb, clus_to_blk(OMFS_SB(dir->i_sb), dir->i_ino));
+	bh = omfs_bread(dir->i_sb, dir->i_ino);
 	if (!bh)
 		goto out;
 

fs/omfs/file.c

@@ -50,7 +50,7 @@ int omfs_shrink_inode(struct inode *inode)
 	if (inode->i_size != 0)
 		goto out;
 
-	bh = sb_bread(inode->i_sb, clus_to_blk(sbi, next));
+	bh = omfs_bread(inode->i_sb, next);
 	if (!bh)
 		goto out;
 
@@ -90,7 +90,7 @@ int omfs_shrink_inode(struct inode *inode)
 		if (next == ~0)
 			break;
 
-		bh = sb_bread(inode->i_sb, clus_to_blk(sbi, next));
+		bh = omfs_bread(inode->i_sb, next);
 		if (!bh)
 			goto out;
 		oe = (struct omfs_extent *) (&bh->b_data[OMFS_EXTENT_CONT]);
@@ -232,7 +232,7 @@ static int omfs_get_block(struct inode *inode, sector_t block,
 	int remain;
 
 	ret = -EIO;
-	bh = sb_bread(inode->i_sb, clus_to_blk(sbi, inode->i_ino));
+	bh = omfs_bread(inode->i_sb, inode->i_ino);
 	if (!bh)
 		goto out;
 
@@ -265,7 +265,7 @@ static int omfs_get_block(struct inode *inode, sector_t block,
 			break;
 
 		brelse(bh);
-		bh = sb_bread(inode->i_sb, clus_to_blk(sbi, next));
+		bh = omfs_bread(inode->i_sb, next);
 		if (!bh)
 			goto out;
 		oe = (struct omfs_extent *) (&bh->b_data[OMFS_EXTENT_CONT]);

fs/omfs/inode.c

@@ -19,6 +19,15 @@ MODULE_AUTHOR("Bob Copeland <me@bobcopeland.com>");
 MODULE_DESCRIPTION("OMFS (ReplayTV/Karma) Filesystem for Linux");
 MODULE_LICENSE("GPL");
 
+struct buffer_head *omfs_bread(struct super_block *sb, sector_t block)
+{
+	struct omfs_sb_info *sbi = OMFS_SB(sb);
+	if (block >= sbi->s_num_blocks)
+		return NULL;
+
+	return sb_bread(sb, clus_to_blk(sbi, block));
+}
+
 struct inode *omfs_new_inode(struct inode *dir, int mode)
 {
 	struct inode *inode;
@@ -93,15 +102,13 @@ static int __omfs_write_inode(struct inode *inode, int wait)
 	struct omfs_inode *oi;
 	struct omfs_sb_info *sbi = OMFS_SB(inode->i_sb);
 	struct buffer_head *bh, *bh2;
-	unsigned int block;
 	u64 ctime;
 	int i;
 	int ret = -EIO;
 	int sync_failed = 0;
 
 	/* get current inode since we may have written sibling ptrs etc. */
-	block = clus_to_blk(sbi, inode->i_ino);
-	bh = sb_bread(inode->i_sb, block);
+	bh = omfs_bread(inode->i_sb, inode->i_ino);
 	if (!bh)
 		goto out;
 
@@ -140,8 +147,7 @@ static int __omfs_write_inode(struct inode *inode, int wait)
 
 	/* if mirroring writes, copy to next fsblock */
 	for (i = 1; i < sbi->s_mirrors; i++) {
-		bh2 = sb_bread(inode->i_sb, block + i *
-			(sbi->s_blocksize / sbi->s_sys_blocksize));
+		bh2 = omfs_bread(inode->i_sb, inode->i_ino + i);
 		if (!bh2)
 			goto out_brelse;
 
@@ -193,7 +199,6 @@ struct inode *omfs_iget(struct super_block *sb, ino_t ino)
 	struct omfs_sb_info *sbi = OMFS_SB(sb);
 	struct omfs_inode *oi;
 	struct buffer_head *bh;
-	unsigned int block;
 	u64 ctime;
 	unsigned long nsecs;
 	struct inode *inode;
@@ -204,8 +209,7 @@ struct inode *omfs_iget(struct super_block *sb, ino_t ino)
 	if (!(inode->i_state & I_NEW))
 		return inode;
 
-	block = clus_to_blk(sbi, ino);
-	bh = sb_bread(inode->i_sb, block);
+	bh = omfs_bread(inode->i_sb, ino);
 	if (!bh)
 		goto iget_failed;
 
@@ -319,6 +323,9 @@ static int omfs_get_imap(struct super_block *sb)
 		goto nomem;
 
 	block = clus_to_blk(sbi, sbi->s_bitmap_ino);
+	if (block >= sbi->s_num_blocks)
+		goto nomem;
+
 	ptr = sbi->s_imap;
 	for (count = bitmap_size; count > 0; count -= sb->s_blocksize) {
 		bh = sb_bread(sb, block++);
@@ -417,7 +424,6 @@ static int omfs_fill_super(struct super_block *sb, void *data, int silent)
 	struct omfs_root_block *omfs_rb;
 	struct omfs_sb_info *sbi;
 	struct inode *root;
-	sector_t start;
 	int ret = -EINVAL;
 
 	save_mount_options(sb, (char *) data);
@@ -486,8 +492,7 @@ static int omfs_fill_super(struct super_block *sb, void *data, int silent)
 	sbi->s_block_shift = get_bitmask_order(sbi->s_blocksize) -
 		get_bitmask_order(sbi->s_sys_blocksize);
 
-	start = clus_to_blk(sbi, be64_to_cpu(omfs_sb->s_root_block));
-	bh2 = sb_bread(sb, start);
+	bh2 = omfs_bread(sb, be64_to_cpu(omfs_sb->s_root_block));
 	if (!bh2)
 		goto out_brelse_bh;
 

fs/omfs/omfs.h

@@ -58,6 +58,7 @@ extern void omfs_make_empty_table(struct buffer_head *bh, int offset);
 extern int omfs_shrink_inode(struct inode *inode);
 
 /* inode.c */
+extern struct buffer_head *omfs_bread(struct super_block *sb, sector_t block);
 extern struct inode *omfs_iget(struct super_block *sb, ino_t inode);
 extern struct inode *omfs_new_inode(struct inode *dir, int mode);
 extern int omfs_reserve_block(struct super_block *sb, sector_t block);