Btrfs: fix oops when btrfs_inherit_iflags called with a NULL dir

chrismason-xx · chrismason-xx · commit 0b4dcea579a1 · 2009-06-11T11:13:35.000-04:00
This happens during subvol creation.

Signed-off-by: Chris Mason &lt;chris.mason@oracle.com&gt;
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
@@ -112,7 +112,12 @@ void btrfs_update_iflags(struct inode *inode)
  */
 void btrfs_inherit_iflags(struct inode *inode, struct inode *dir)
 {
-	unsigned int flags = BTRFS_I(dir)->flags;
+	unsigned int flags;
+
+	if (!dir)
+		return;
+
+	flags = BTRFS_I(dir)->flags;
 
 	if (S_ISREG(inode->i_mode))
 		flags &= ~BTRFS_INODE_DIRSYNC;
