linux-kernel - [PATCH 5.15 870/917] ksmbd: dont need 8byte alignment for request length in ksmbd_check

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Date:   Mon, 15 Nov 2021 18:06:05 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Hyunchul Lee <hyc.lee@...il.com>,
        Namjae Jeon <linkinjeon@...nel.org>,
        Steve French <stfrench@...rosoft.com>
Subject: [PATCH 5.15 870/917] ksmbd: dont need 8byte alignment for request length in ksmbd_check_message

From: Namjae Jeon <linkinjeon@...nel.org>

commit b53ad8107ee873795ecb5039d46b5d5502d404f2 upstream.

When validating request length in ksmbd_check_message, 8byte alignment
is not needed for compound request. It can cause wrong validation
of request length.

Fixes: e2f34481b24d ("cifsd: add server-side procedures for SMB3")
Cc: stable@...r.kernel.org # v5.15
Acked-by: Hyunchul Lee <hyc.lee@...il.com>
Signed-off-by: Namjae Jeon <linkinjeon@...nel.org>
Signed-off-by: Steve French <stfrench@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/ksmbd/smb2misc.c |    6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

--- a/fs/ksmbd/smb2misc.c
+++ b/fs/ksmbd/smb2misc.c
@@ -358,12 +358,10 @@ int ksmbd_smb2_check_message(struct ksmb
 		hdr = &pdu->hdr;
 	}
 
-	if (le32_to_cpu(hdr->NextCommand) > 0) {
+	if (le32_to_cpu(hdr->NextCommand) > 0)
 		len = le32_to_cpu(hdr->NextCommand);
-	} else if (work->next_smb2_rcv_hdr_off) {
+	else if (work->next_smb2_rcv_hdr_off)
 		len -= work->next_smb2_rcv_hdr_off;
-		len = round_up(len, 8);
-	}
 
 	if (check_smb2_hdr(hdr))
 		return 1;