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authorBob Copeland <me@bobcopeland.com>2008-09-07 01:51:53 +0400
committerBob Copeland <me@bobcopeland.com>2010-07-10 22:37:06 +0400
commitf068272cb2f134a194b93e94a8e0672bfce48cd8 (patch)
treec6a2a67951646eee3d040b732b384fa5c98fe78c /fs/omfs/dir.c
parent70d9e384aa7df681cfffd65947af72b22e86690e (diff)
downloadlinux-f068272cb2f134a194b93e94a8e0672bfce48cd8.tar.xz
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>
Diffstat (limited to 'fs/omfs/dir.c')
-rw-r--r--fs/omfs/dir.c22
1 files changed, 8 insertions, 14 deletions
diff --git a/fs/omfs/dir.c b/fs/omfs/dir.c
index b42d62419034..393f3f659da7 100644
--- a/fs/omfs/dir.c
+++ b/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;