From 1dd578e985604d317756349a8f2b71959aeea324 Mon Sep 17 00:00:00 2001 From: Namjae Jeon Date: Fri, 29 Oct 2021 08:09:50 +0900 Subject: [PATCH] ksmbd: don't need 8byte alignment for request length in ksmbd_check_message 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@vger.kernel.org # v5.15 Acked-by: Hyunchul Lee Signed-off-by: Namjae Jeon Signed-off-by: Steve French Signed-off-by: Greg Kroah-Hartman --- fs/ksmbd/smb2misc.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/fs/ksmbd/smb2misc.c b/fs/ksmbd/smb2misc.c index 030ca57c37849..9f516f73bd1b6 100644 --- a/fs/ksmbd/smb2misc.c +++ b/fs/ksmbd/smb2misc.c @@ -358,12 +358,10 @@ int ksmbd_smb2_check_message(struct ksmbd_work *work) 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;