Nik pointed that the VRF driver should be using skb_header_pointer
instead of accessing skb->data and bits beyond directly which can
be garbage.
Cc: Nikolay Aleksandrov <niko...@cumulusnetworks.com>
Signed-off-by: David Ahern <d...@cumulusnetworks.com>
---
Dave: This should go into v4.4 stable as well.
drivers/net/vrf.c | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)
diff --git a/drivers/net/vrf.c b/drivers/net/vrf.c
index 9ce088bb28ab..9a9fabb900c1 100644
--- a/drivers/net/vrf.c
+++ b/drivers/net/vrf.c
@@ -103,20 +103,23 @@ static struct dst_ops vrf_dst_ops = {
#if IS_ENABLED(CONFIG_IPV6)
static bool check_ipv6_frame(const struct sk_buff *skb)
{
- const struct ipv6hdr *ipv6h = (struct ipv6hdr *)skb->data;
- size_t hlen = sizeof(*ipv6h);
+ const struct ipv6hdr *ipv6h;
+ struct ipv6hdr _ipv6h;
bool rc = true;
- if (skb->len < hlen)
+ ipv6h = skb_header_pointer(skb, 0, sizeof(_ipv6h), &_ipv6h);
+ if (!ipv6h)
goto out;
if (ipv6h->nexthdr == NEXTHDR_ICMP) {
const struct icmp6hdr *icmph;
+ struct icmp6hdr _icmph;
- if (skb->len < hlen + sizeof(*icmph))
+ icmph = skb_header_pointer(skb, sizeof(_ipv6h),
+ sizeof(_icmph), &_icmph);
+ if (!icmph)
goto out;
- icmph = (struct icmp6hdr *)(skb->data + sizeof(*ipv6h));
switch (icmph->icmp6_type) {
case NDISC_ROUTER_SOLICITATION:
case NDISC_ROUTER_ADVERTISEMENT:
--
2.1.4
