FAILED: patch "[PATCH] ksmbd: fix error code overwriting in" failed to apply to 5.15-stable tree

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 <[email protected]>.

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 88daf2f448aad05a2e6df738d66fe8b0cf85cee0
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2025101324-echo-cardinal-3043@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^..

Possible dependencies:

thanks,

greg k-h

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

From 88daf2f448aad05a2e6df738d66fe8b0cf85cee0 Mon Sep 17 00:00:00 2001
From: Matvey Kovalev <[email protected]>
Date: Thu, 25 Sep 2025 15:12:34 +0300
Subject: [PATCH] ksmbd: fix error code overwriting in
smb2_get_info_filesystem()

If client doesn't negotiate with SMB3.1.1 POSIX Extensions, then proper error code won't be returned due to overwriting.

Return error immediately.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

index 0c069eff80b7..133ca5beb7cf 100644
@@ -5629,7 +5629,8 @@ static int smb2_get_info_filesystem(struct ksmbd_work *work,
 
 		if (!work->tcon->posix_extensions) {
 			pr_err("client doesn't negotiate with SMB3.1.1 POSIX Extensions\n");
-			rc = -EOPNOTSUPP;
+			path_put(&path);
+			return -EOPNOTSUPP;
 		} else {
 			info = (struct filesystem_posix_info *)(rsp->Buffer);
 			info->OptimalTransferSize = cpu_to_le32(stfs.f_bsize);

From: Matvey Kovalev <[email protected]>

[ Upstream commit 88daf2f448aad05a2e6df738d66fe8b0cf85cee0 ]

If client doesn't negotiate with SMB3.1.1 POSIX Extensions, then proper error code won't be returned due to overwriting.

Return error immediately.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

---
 fs/ksmbd/smb2pdu.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

index 3439dbad93895..c0b5985701bf8 100644
@@ -5204,7 +5204,8 @@ static int smb2_get_info_filesystem(struct ksmbd_work *work,
 
 		if (!work->tcon->posix_extensions) {
 			pr_err("client doesn't negotiate with SMB3.1.1 POSIX Extensions\n");
-			rc = -EOPNOTSUPP;
+			path_put(&path);
+			return -EOPNOTSUPP;
 		} else {
 			info = (struct filesystem_posix_info *)(rsp->Buffer);
 			info->OptimalTransferSize = cpu_to_le32(stfs.f_bsize);

2.51.0