6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Matt Johnston <matt@xxxxxxxxxxxxxxxxxxxx>
[ Upstream commit 01e215975fd80af81b5b79f009d49ddd35976c13 ]
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@xxxxxxxxxxxxxxx
Reported-by: Dung Cao <dung@xxxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Matt Johnston <matt@xxxxxxxxxxxxxxxxxxxx>
Reviewed-by: Simon Horman <horms@xxxxxxxxxx>
Link: https://patch.msgid.link/20241022-mctp-i2c-null-dest-v3-1-e929709956c5@xxxxxxxxxxxxxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
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 b37a9e4bade4a..20b8d7d528baf 100644
--- a/drivers/net/mctp/mctp-i2c.c
+++ b/drivers/net/mctp/mctp-i2c.c
@@ -547,6 +547,9 @@ 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);
--
2.43.0
