From: Steve French <smfrench@gmail.com>
Date: Mon, 15 Sep 2014 04:27:09 +0000 (-0500)
Subject: SMB3: Fix oops when creating symlinks on smb3
X-Git-Tag: v3.14.20~106
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=d51afb094e833d28085f2a6c35b179260d981bb2;p=profile%2Fcommon%2Fkernel-common.git

SMB3: Fix oops when creating symlinks on smb3

commit da80659d4aa758dc6935b10ec64513f0b67bc969 upstream.

We were not checking for symlink support properly for SMB2/SMB3
mounts so could oops when mounted with mfsymlinks when try
to create symlink when mfsymlinks on smb2/smb3 mounts

Signed-off-by: Steve French <smfrench@gmail.com>
CC: Sachin Prabhu <sprabhu@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/fs/cifs/link.c b/fs/cifs/link.c
index 68559fd..a5c2812 100644
--- a/fs/cifs/link.c
+++ b/fs/cifs/link.c
@@ -213,8 +213,12 @@ create_mf_symlink(const unsigned int xid, struct cifs_tcon *tcon,
 	if (rc)
 		goto out;
 
-	rc = tcon->ses->server->ops->create_mf_symlink(xid, tcon, cifs_sb,
-					fromName, buf, &bytes_written);
+	if (tcon->ses->server->ops->create_mf_symlink)
+		rc = tcon->ses->server->ops->create_mf_symlink(xid, tcon,
+					cifs_sb, fromName, buf, &bytes_written);
+	else
+		rc = -EOPNOTSUPP;
+
 	if (rc)
 		goto out;