Patch "CIFS: Fix NULL pointer deref on SMB2_tcon() failure" has been added to the 4.13-stable tree

This is a note to let you know that I've just added the patch titled

CIFS: Fix NULL pointer deref on SMB2_tcon() failure

to the 4.13-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
cifs-fix-null-pointer-deref-on-smb2_tcon-failure.patch
and it can be found in the queue-4.13 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: =?UTF-8?q?Aur=C3=A9lien=20Aptel?= <[email protected]>
Date: Wed, 11 Oct 2017 13:23:36 +0200
Subject: CIFS: Fix NULL pointer deref on SMB2_tcon() failure

From: Aurélien Aptel <[email protected]>

commit db3b5474f462e77b82ca1e27627f03c47b622c99 upstream.

If SendReceive2() fails rsp is set to NULL but is dereferenced in the error handling code.

---
 fs/cifs/smb2pdu.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

@@ -1243,7 +1243,7 @@ SMB2_tcon(const unsigned int xid, struct
 	struct smb2_tree_connect_req *req;
 	struct smb2_tree_connect_rsp *rsp = NULL;
 	struct kvec iov[2];
-	struct kvec rsp_iov;
+	struct kvec rsp_iov = { NULL, 0 };
 	int rc = 0;
 	int resp_buftype;
 	int unc_path_len;

@@ -1360,7 +1360,7 @@ tcon_exit:
 	return rc;
 
 tcon_error_exit:
-	if (rsp->hdr.sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
+	if (rsp && rsp->hdr.sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
 		cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
 	}
 	goto tcon_exit;

Patches currently in stable-queue which might be from [email protected] are

queue-4.13/cifs-fix-null-pointer-deref-on-smb2_tcon-failure.patch queue-4.13/cifs-select-all-required-crypto-modules.patch