[PATCH 5.15.y] ksmbd: fix error code overwriting in smb2_get_info_filesystem()

[Sasha Levin <sashal@kernel.org>]

From: Matvey Kovalev <matvey.kovalev@ispras.ru>

[ 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.

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>
[ adjusted file path from fs/smb/server/smb2pdu.c to fs/ksmbd/smb2pdu.c ]
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/ksmbd/smb2pdu.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c
index 3439dbad93895..c0b5985701bf8 100644
--- a/fs/ksmbd/smb2pdu.c
+++ b/fs/ksmbd/smb2pdu.c
@@ -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