From 01e215975fd80af81b5b79f009d49ddd35976c13 Mon Sep 17 00:00:00 2001 From: Matt Johnston Date: Tue, 22 Oct 2024 18:25:14 +0800 Subject: [PATCH] mctp i2c: handle NULL header address daddr can be NULL if there is no neighbour table entry present, in that case the tx packet should be dropped. saddr will usually be set by MCTP core, but check for NULL in case a packet is transmitted by a different protocol. Fixes: f5b8abf9fc3d ("mctp i2c: MCTP I2C binding driver") Cc: stable@vger.kernel.org Reported-by: Dung Cao Signed-off-by: Matt Johnston Reviewed-by: Simon Horman Link: https://patch.msgid.link/20241022-mctp-i2c-null-dest-v3-1-e929709956c5@codeconstruct.com.au Signed-off-by: Jakub Kicinski --- drivers/net/mctp/mctp-i2c.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/net/mctp/mctp-i2c.c b/drivers/net/mctp/mctp-i2c.c index 4dc057c121f5..e70fb6687994 100644 --- a/drivers/net/mctp/mctp-i2c.c +++ b/drivers/net/mctp/mctp-i2c.c @@ -588,6 +588,9 @@ static int mctp_i2c_header_create(struct sk_buff *skb, struct net_device *dev, if (len > MCTP_I2C_MAXMTU) return -EMSGSIZE; + if (!daddr || !saddr) + return -EINVAL; + lldst = *((u8 *)daddr); llsrc = *((u8 *)saddr); -- 2.50.1