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authorJeremy Kerr <jk@codeconstruct.com.au>2022-02-18 12:25:54 +0800
committerJakub Kicinski <kuba@kernel.org>2022-02-18 21:24:29 -0800
commit86cdfd63f25dc1c8f241ee70c58da3c10472b76e (patch)
tree1e158db45b1ed7454f438c240ae3924b36a49b03 /net/mctp
parentcb196b725936f6b776ad1d073f66fbe92aa798fa (diff)
downloadlinux-86cdfd63f25dc1c8f241ee70c58da3c10472b76e.tar.bz2
mctp: add address validity checking for packet receive
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>
Diffstat (limited to 'net/mctp')
-rw-r--r--net/mctp/route.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/net/mctp/route.c b/net/mctp/route.c
index 6a11d78cfbab..fe6c8bf1ec2c 100644
--- a/net/mctp/route.c
+++ b/net/mctp/route.c
@@ -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);