FAILED: patch "[PATCH] smb: client: close handle after create-context parsing" failed to apply to 6.18-stable tree

[<gregkh@linuxfoundation.org>]

The patch below does not apply to the 6.18-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>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.18.y
git checkout FETCH_HEAD
git cherry-pick -x 566820af017e81497fb5e9d3ad6e7ffe2828bc8b
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2026092944-consensus-idealism-4247@gregkh' --subject-prefix 'PATCH 6.18.y' 'HEAD^..'

Possible dependencies:



thanks,

greg k-h

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

From 566820af017e81497fb5e9d3ad6e7ffe2828bc8b Mon Sep 17 00:00:00 2001
From: Zihan Xi <zihanx@nebusec.ai>
Date: Wed, 16 Sep 2026 15:29:26 +0000
Subject: [PATCH] smb: client: close handle after create-context parsing
 failure

SMB2_open() accounts a successful CREATE response as a remote open before
parsing its create contexts.  If smb2_parse_contexts() rejects malformed
context data, SMB2_open() returns without closing the handle, leaving the
server-side handle open and num_remote_opens elevated.

Close the handle after a post-CREATE context parsing failure so the error
path releases the remote resource and balances the open count.

Fixes: af1689a9b770 ("smb: client: fix potential OOBs in smb2_parse_contexts()")
Cc: stable@vger.kernel.org
Reported-by: Vega <vega@nebusec.ai>
Assisted-by: LLM
Co-developed-by: Luxing Yin <root@tr0jan.top>
Signed-off-by: Luxing Yin <root@tr0jan.top>
Signed-off-by: Zihan Xi <zihanx@nebusec.ai>
Tested-by: Frank Sorenson <sorenson@redhat.com>
Signed-off-by: Paulo Alcantara <pc@manguebit.org>

diff --git a/fs/smb/client/smb2pdu.c b/fs/smb/client/smb2pdu.c
index 538d708b0404..3d7ead36d1a0 100644
--- a/fs/smb/client/smb2pdu.c
+++ b/fs/smb/client/smb2pdu.c
@@ -3416,6 +3416,9 @@ replay_again:
 
 	rc = smb2_parse_contexts(server, &rsp_iov, &oparms->fid->epoch,
 				 oparms->fid->lease_key, oplock, file_info, posix);
+	if (rc)
+		SMB2_close(xid, tcon, oparms->fid->persistent_fid,
+			   oparms->fid->volatile_fid);
 
 	trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid, ses->Suid,
 			     oparms->create_options, oparms->desired_access,