linux-kernel - [PATCH] fix error code overwriting in smb2_get_info

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Message-ID: <20250925121255.1407-1-matvey.kovalev@ispras.ru>
Date: Thu, 25 Sep 2025 15:12:34 +0300
From: Matvey Kovalev <matvey.kovalev@...ras.ru>
To: Namjae Jeon <linkinjeon@...nel.org>
Cc: Matvey Kovalev <matvey.kovalev@...ras.ru>,
	Steve French <smfrench@...il.com>,
	Sergey Senozhatsky <senozhatsky@...omium.org>,
	Tom Talpey <tom@...pey.com>,
	linux-cifs@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	lvc-project@...uxtesting.org,
	stable@...r.kernel.org
Subject: [PATCH] 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@...r.kernel.org
Signed-off-by: Matvey Kovalev <matvey.kovalev@...ras.ru>
---
 fs/smb/server/smb2pdu.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/smb/server/smb2pdu.c b/fs/smb/server/smb2pdu.c
index a565fc36cee6d..a1db006ab6e92 100644
--- a/fs/smb/server/smb2pdu.c
+++ b/fs/smb/server/smb2pdu.c
@@ -5628,7 +5628,8 @@ 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);
-- 
2.43.0.windows.1