FAILED: patch "[PATCH] ksmbd: free aux buffer if ksmbd_iov_pin_rsp_read fails" failed to apply to 5.15-stable tree

[<gregkh@linuxfoundation.org>]

The patch below does not apply to the 5.15-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-5.15.y
git checkout FETCH_HEAD
git cherry-pick -x 108a020c64434fed4b69762879d78cd24088b4c7
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2024021954-gallows-product-204d@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^..

Possible dependencies:

108a020c6443 ("ksmbd: free aux buffer if ksmbd_iov_pin_rsp_read fails")
1903e6d05781 ("ksmbd: fix potential double free on smb2_read_pipe() error path")
e2b76ab8b5c9 ("ksmbd: add support for read compound")
e202a1e8634b ("ksmbd: no response from compound read")
7b7d709ef7cf ("ksmbd: add missing compound request handing in some commands")
81a94b27847f ("ksmbd: use kvzalloc instead of kvmalloc")
38c8a9a52082 ("smb: move client and server files to common directory fs/smb")
30210947a343 ("ksmbd: fix racy issue under cocurrent smb2 tree disconnect")
abcc506a9a71 ("ksmbd: fix racy issue from smb2 close and logoff with multichannel")
ea174a918939 ("ksmbd: destroy expired sessions")
f5c779b7ddbd ("ksmbd: fix racy issue from session setup and logoff")
74d7970febf7 ("ksmbd: fix racy issue from using ->d_parent and ->d_name")
34e8ccf9ce24 ("ksmbd: set NegotiateContextCount once instead of every inc")
42bc6793e452 ("Merge tag 'pull-lock_rename_child' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs into ksmbd-for-next")

thanks,

greg k-h

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

From 108a020c64434fed4b69762879d78cd24088b4c7 Mon Sep 17 00:00:00 2001
From: Fedor Pchelkin <pchelkin@ispras.ru>
Date: Mon, 5 Feb 2024 14:19:16 +0300
Subject: [PATCH] ksmbd: free aux buffer if ksmbd_iov_pin_rsp_read fails

ksmbd_iov_pin_rsp_read() doesn't free the provided aux buffer if it
fails. Seems to be the caller's responsibility to clear the buffer in
error case.

Found by Linux Verification Center (linuxtesting.org).

Fixes: e2b76ab8b5c9 ("ksmbd: add support for read compound")
Cc: stable@vger.kernel.org
Signed-off-by: Fedor Pchelkin <pchelkin@ispras.ru>
Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>

diff --git a/fs/smb/server/smb2pdu.c b/fs/smb/server/smb2pdu.c
index ba7a72a6a4f4..0c97d3c86072 100644
--- a/fs/smb/server/smb2pdu.c
+++ b/fs/smb/server/smb2pdu.c
@@ -6173,8 +6173,10 @@ static noinline int smb2_read_pipe(struct ksmbd_work *work)
 		err = ksmbd_iov_pin_rsp_read(work, (void *)rsp,
 					     offsetof(struct smb2_read_rsp, Buffer),
 					     aux_payload_buf, nbytes);
-		if (err)
+		if (err) {
+			kvfree(aux_payload_buf);
 			goto out;
+		}
 		kvfree(rpc_resp);
 	} else {
 		err = ksmbd_iov_pin_rsp(work, (void *)rsp,
@@ -6384,8 +6386,10 @@ int smb2_read(struct ksmbd_work *work)
 	err = ksmbd_iov_pin_rsp_read(work, (void *)rsp,
 				     offsetof(struct smb2_read_rsp, Buffer),
 				     aux_payload_buf, nbytes);
-	if (err)
+	if (err) {
+		kvfree(aux_payload_buf);
 		goto out;
+	}
 	ksmbd_fd_put(work, fp);
 	return 0;