lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Date:	Mon, 24 Mar 2008 17:34:16 +0900
From:	joonwpark81@...il.com
To:	acme@...stprotocols.net
Cc:	Joonwoo Park <joonwpark81@...il.com>, netdev@...r.kernel.org
Subject: [PATCH 2/3] [LLC]: bogus llc packet length

From: Joonwoo Park <joonwpark81@...il.com>

discard llc packet which has bogus packet length.

Signed-off-by: Joonwoo Park <joonwpark81@...il.com>
---
diff --git a/net/llc/llc_input.c b/net/llc/llc_input.c
index c40c9b2..a2bbc7c 100644
--- a/net/llc/llc_input.c
+++ b/net/llc/llc_input.c
@@ -117,8 +117,12 @@ static inline int llc_fixup_skb(struct sk_buff *skb)
 	skb_pull(skb, llc_len);
 	if (skb->protocol == htons(ETH_P_802_2)) {
 		__be16 pdulen = eth_hdr(skb)->h_proto;
-		u16 data_size = ntohs(pdulen) - llc_len;
+		s32 data_size = ntohs(pdulen) - llc_len;
 
+		if (data_size < 0
+		    || ((skb_tail_pointer(skb) - (u8 *)pdu) - llc_len)
+			< data_size)
+			return 0;
 		if (unlikely(pskb_trim_rcsum(skb, data_size)))
 			return 0;
 	}
-- 
1.5.4.3

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Powered by blists - more mailing lists