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 88daf2f448aad05a2e6df738d66fe8b0cf85cee0 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --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 matvey.kovalev@ispras.ru 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.

Fixes: e2f34481b24db ("cifsd: add server-side procedures for SMB3") Cc: stable@vger.kernel.org Signed-off-by: Matvey Kovalev matvey.kovalev@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 0c069eff80b7..133ca5beb7cf 100644 --- a/fs/smb/server/smb2pdu.c +++ b/fs/smb/server/smb2pdu.c @@ -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);