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mctp: add address validity checking for packet receive

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This change adds some basic sanity checks for the source and dest
headers of packets on initial receive.

Signed-off-by: Jeremy Kerr <jk@codeconstruct.com.au>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jeremy Kerr 2022-02-18 12:25:54 +08:00 committed by Jakub Kicinski
parent cb196b7259
commit 86cdfd63f2
1 changed files with 11 additions and 0 deletions
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11
net/mctp/route.c
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@ -1092,6 +1092,17 @@ static int mctp_pkttype_receive(struct sk_buff *skb, struct net_device *dev,
if (mh->ver < MCTP_VER_MIN || mh->ver > MCTP_VER_MAX)
goto err_drop;
/* source must be valid unicast or null; drop reserved ranges and
* broadcast
*/
if (!(mctp_address_unicast(mh->src) || mctp_address_null(mh->src)))
goto err_drop;
/* dest address: as above, but allow broadcast */
if (!(mctp_address_unicast(mh->dest) || mctp_address_null(mh->dest) ||
mctp_address_broadcast(mh->dest)))
goto err_drop;
/* MCTP drivers must populate halen/haddr */
if (dev->type == ARPHRD_MCTP) {
cb = mctp_cb(skb);