FAILED: patch "[PATCH] cifs: allow calling SMB2_xxx_free(NULL)" failed to apply to 4.19-stable tree

[<gregkh@linuxfoundation.org>]

The patch below does not apply to the 4.19-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

>From 32a1fb36f6e50183871c2c1fcf5493c633e84732 Mon Sep 17 00:00:00 2001
From: Ronnie Sahlberg <lsahlber@redhat.com>
Date: Wed, 24 Oct 2018 11:50:33 +1000
Subject: [PATCH] cifs: allow calling SMB2_xxx_free(NULL)

Change these free functions to allow passing NULL as the argument and
treat it as a no-op just like free(NULL) would.
Or, if rqst->rq_iov is NULL.

The second scenario could happen for smb2_queryfs() if the call
to SMB2_query_info_init() fails and we go to qfs_exit to clean up
and free all resources.
In that case we have not yet assigned rqst[2].rq_iov and thus
the rq_iov dereference in SMB2_close_free() will cause a NULL pointer
dereference.

Fixes:  1eb9fb52040f ("cifs: create SMB2_open_init()/SMB2_open_free() helpers")

Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Reviewed-by: Aurelien Aptel <aaptel@suse.com>
CC: Stable <stable@vger.kernel.org>

diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 5a08c8f6a322..7d7b016fe8bb 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -2243,10 +2243,12 @@ SMB2_open_free(struct smb_rqst *rqst)
 {
 	int i;
 
-	cifs_small_buf_release(rqst->rq_iov[0].iov_base);
-	for (i = 1; i < rqst->rq_nvec; i++)
-		if (rqst->rq_iov[i].iov_base != smb2_padding)
-			kfree(rqst->rq_iov[i].iov_base);
+	if (rqst && rqst->rq_iov) {
+		cifs_small_buf_release(rqst->rq_iov[0].iov_base);
+		for (i = 1; i < rqst->rq_nvec; i++)
+			if (rqst->rq_iov[i].iov_base != smb2_padding)
+				kfree(rqst->rq_iov[i].iov_base);
+	}
 }
 
 int
@@ -2536,7 +2538,8 @@ SMB2_close_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
 void
 SMB2_close_free(struct smb_rqst *rqst)
 {
-	cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
+	if (rqst && rqst->rq_iov)
+		cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
 }
 
 int
@@ -2689,7 +2692,8 @@ SMB2_query_info_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
 void
 SMB2_query_info_free(struct smb_rqst *rqst)
 {
-	cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
+	if (rqst && rqst->rq_iov)
+		cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
 }
 
 static int
@@ -3803,7 +3807,8 @@ SMB2_set_info_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
 void
 SMB2_set_info_free(struct smb_rqst *rqst)
 {
-	cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
+	if (rqst && rqst->rq_iov)
+		cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
 }
 
 static int