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authorGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-01-30 12:37:35 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-01-30 12:39:49 +0100
commit37ea7b630ae5cdea4e8ff381d9d23abfef5939e6 (patch)
treefd3836565f8255135394477d1fcc9d4fb5771286 /fs/debugfs
parentff9fb72bc07705c00795ca48631f7fffe24d2c6b (diff)
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debugfs: debugfs_lookup() should return NULL if not found
Lots of callers of debugfs_lookup() were just checking NULL to see if the file/directory was found or not. By changing this in ff9fb72bc077 ("debugfs: return error values, not NULL") we caused some subsystems to easily crash. Fixes: ff9fb72bc077 ("debugfs: return error values, not NULL") Reported-by: syzbot+b382ba6a802a3d242790@syzkaller.appspotmail.com Reported-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Cc: Omar Sandoval <osandov@fb.com> Cc: Jens Axboe <axboe@fb.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/debugfs')
-rw-r--r--fs/debugfs/inode.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c
index b16f8035b1af..29c68c5d44d5 100644
--- a/fs/debugfs/inode.c
+++ b/fs/debugfs/inode.c
@@ -254,8 +254,8 @@ MODULE_ALIAS_FS("debugfs");
* @parent: a pointer to the parent dentry of the file.
*
* This function will return a pointer to a dentry if it succeeds. If the file
- * doesn't exist or an error occurs, %ERR_PTR(-ERROR) will be returned. The
- * returned dentry must be passed to dput() when it is no longer needed.
+ * doesn't exist or an error occurs, %NULL will be returned. The returned
+ * dentry must be passed to dput() when it is no longer needed.
*
* If debugfs is not enabled in the kernel, the value -%ENODEV will be
* returned.
@@ -265,17 +265,17 @@ struct dentry *debugfs_lookup(const char *name, struct dentry *parent)
struct dentry *dentry;
if (IS_ERR(parent))
- return parent;
+ return NULL;
if (!parent)
parent = debugfs_mount->mnt_root;
dentry = lookup_one_len_unlocked(name, parent, strlen(name));
if (IS_ERR(dentry))
- return dentry;
+ return NULL;
if (!d_really_is_positive(dentry)) {
dput(dentry);
- return ERR_PTR(-EINVAL);
+ return NULL;
}
return dentry;
}