Commit 2f3bb642 authored Apr 18, 2017 by David Lebrun Committed by David S. Miller Apr 20, 2017

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 <andreyknvl@google.com>
Cc: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: David Lebrun <david.lebrun@uclouvain.be>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent c1f8d0f9

net/ipv6/seg6.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -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;

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