From: Namjae Jeon <linkinjeon@kernel.org>
Date: Sat, 22 Jan 2022 01:47:22 +0000 (+0900)
Subject: ksmbd: fix SMB 3.11 posix extension mount failure
X-Git-Tag: v6.6.17~8223^2~5
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=9ca8581e79e51c57e60b3b8e3b89d816448f49fe;p=platform%2Fkernel%2Flinux-rpi.git

ksmbd: fix SMB 3.11 posix extension mount failure

cifs client set 4 to DataLength of create_posix context, which mean
Mode variable of create_posix context is only available. So buffer
validation of ksmbd should check only the size of Mode except for
the size of Reserved variable.

Fixes: 8f77150c15f8 ("ksmbd: add buffer validation for SMB2_CREATE_CONTEXT")
Cc: stable@vger.kernel.org # v5.15+
Reported-by: Steve French <smfrench@gmail.com>
Tested-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
---

diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c
index 1866c81..3926ca18 100644
--- a/fs/ksmbd/smb2pdu.c
+++ b/fs/ksmbd/smb2pdu.c
@@ -2688,7 +2688,7 @@ int smb2_open(struct ksmbd_work *work)
 					(struct create_posix *)context;
 				if (le16_to_cpu(context->DataOffset) +
 				    le32_to_cpu(context->DataLength) <
-				    sizeof(struct create_posix)) {
+				    sizeof(struct create_posix) - 4) {
 					rc = -EINVAL;
 					goto err_out1;
 				}