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net: bridge: stp: don't cache eth dest pointer before skb pull

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[ Upstream commit 2446a68ae6a8cee6d480e2f5b52f5007c7c41312 ]

Don't cache eth dest pointer before calling pskb_may_pull.

Fixes: cf0f02d04a83 ("[BRIDGE]: use llc for receiving STP packets")
Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Nikolay Aleksandrov 2019-07-02 15:00:21 +03:00 committed by Greg Kroah-Hartman
parent c060a35bbe
commit eaee127e4a
1 changed files with 1 additions and 2 deletions
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3
net/bridge/br_stp_bpdu.c
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@ -147,7 +147,6 @@ void br_send_tcn_bpdu(struct net_bridge_port *p)
void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
struct net_device *dev)
{
const unsigned char *dest = eth_hdr(skb)->h_dest;
struct net_bridge_port *p;
struct net_bridge *br;
const unsigned char *buf;
@ -176,7 +175,7 @@ void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
if (p->state == BR_STATE_DISABLED)
goto out;
if (!ether_addr_equal(dest, br->group_addr))
if (!ether_addr_equal(eth_hdr(skb)->h_dest, br->group_addr))
goto out;
if (p->flags & BR_BPDU_GUARD) {