From 237f4b71599d802ad87c8702a83465c6523b7527 Mon Sep 17 00:00:00 2001 From: Namjae Jeon Date: Sat, 11 Feb 2023 00:27:34 +0900 Subject: ksmbd: do not allow the actual frame length to be smaller than the rfc1002 length commit fb533473d1595fe79ecb528fda1de33552b07178 upstream. ksmbd allowed the actual frame length to be smaller than the rfc1002 length. If allowed, it is possible to allocates a large amount of memory that can be limited by credit management and can eventually cause memory exhaustion problem. This patch do not allow it except SMB2 Negotiate request which will be validated when message handling proceeds. Also, Allow a message that padded to 8byte boundary. Fixes: e2f34481b24d ("cifsd: add server-side procedures for SMB3") Cc: stable@vger.kernel.org Signed-off-by: Namjae Jeon Signed-off-by: Steve French Signed-off-by: Greg Kroah-Hartman --- fs/ksmbd/smb2misc.c | 21 ++++++++++----------- 1 file changed, 10 insertions(+), 11 deletions(-) (limited to 'fs/ksmbd') diff --git a/fs/ksmbd/smb2misc.c b/fs/ksmbd/smb2misc.c index a717aa9b4af8..fbdde426dd01 100644 --- a/fs/ksmbd/smb2misc.c +++ b/fs/ksmbd/smb2misc.c @@ -408,20 +408,19 @@ int ksmbd_smb2_check_message(struct ksmbd_work *work) goto validate_credit; /* - * windows client also pad up to 8 bytes when compounding. - * If pad is longer than eight bytes, log the server behavior - * (once), since may indicate a problem but allow it and - * continue since the frame is parseable. + * SMB2 NEGOTIATE request will be validated when message + * handling proceeds. */ - if (clc_len < len) { - ksmbd_debug(SMB, - "cli req padded more than expected. Length %d not %d for cmd:%d mid:%llu\n", - len, clc_len, command, - le64_to_cpu(hdr->MessageId)); + if (command == SMB2_NEGOTIATE_HE) + goto validate_credit; + + /* + * Allow a message that padded to 8byte boundary. + */ + if (clc_len < len && (len - clc_len) < 8) goto validate_credit; - } - ksmbd_debug(SMB, + pr_err_ratelimited( "cli req too short, len %d not %d. cmd:%d mid:%llu\n", len, clc_len, command, le64_to_cpu(hdr->MessageId)); -- cgit v1.2.3