Commit 34d19bad authored by Julia Lawall's avatar Julia Lawall Committed by Chris Mason

fs/btrfs/inode.c: Add missing IS_ERR test

After the conditional that precedes the following code, inode may be an
ERR_PTR value.  This can eg result from a memory allocation failure via the
call to btrfs_iget, and thus does not imply that root is different than
sub_root.  Thus, an IS_ERR check is added to ensure that there is no
dereference of inode in this case.

The semantic match that finds this problem is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@r@
identifier f;
@@
f(...) { ... return ERR_PTR(...); }

@@
identifier r.f, fld;
expression x;
statement S1,S2;
@@
 x = f(...)
 ... when != IS_ERR(x)
(
 if (IS_ERR(x) ||...) S1 else S2
|
*x->fld
)
// </smpl>
Signed-off-by: default avatarJulia Lawall <julia@diku.dk>
Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
parent 333e8105
...@@ -4137,7 +4137,7 @@ struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry) ...@@ -4137,7 +4137,7 @@ struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry)
} }
srcu_read_unlock(&root->fs_info->subvol_srcu, index); srcu_read_unlock(&root->fs_info->subvol_srcu, index);
if (root != sub_root) { if (!IS_ERR(inode) && root != sub_root) {
down_read(&root->fs_info->cleanup_work_sem); down_read(&root->fs_info->cleanup_work_sem);
if (!(inode->i_sb->s_flags & MS_RDONLY)) if (!(inode->i_sb->s_flags & MS_RDONLY))
btrfs_orphan_cleanup(sub_root); btrfs_orphan_cleanup(sub_root);
......
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