From 2f3bb64247b5b083d05ccecad9c2e139bbfdc294 Mon Sep 17 00:00:00 2001 From: David Lebrun Date: Tue, 18 Apr 2017 17:59:49 +0200 Subject: ipv6: sr: fix out-of-bounds access in SRH validation This patch fixes an out-of-bounds access in seg6_validate_srh() when the trailing data is less than sizeof(struct sr6_tlv). Reported-by: Andrey Konovalov Cc: Andrey Konovalov Signed-off-by: David Lebrun Signed-off-by: David S. Miller --- net/ipv6/seg6.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'net/ipv6') diff --git a/net/ipv6/seg6.c b/net/ipv6/seg6.c index a855eb325b03..5f44ffed2576 100644 --- a/net/ipv6/seg6.c +++ b/net/ipv6/seg6.c @@ -53,6 +53,9 @@ bool seg6_validate_srh(struct ipv6_sr_hdr *srh, int len) struct sr6_tlv *tlv; unsigned int tlv_len; + if (trailing < sizeof(*tlv)) + return false; + tlv = (struct sr6_tlv *)((unsigned char *)srh + tlv_offset); tlv_len = sizeof(*tlv) + tlv->len; -- cgit v1.2.3