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authorZhang Changzhong <zhangchangzhong@huawei.com>2021-10-28 22:38:27 +0800
committerMarc Kleine-Budde <mkl@pengutronix.de>2021-11-06 17:29:32 +0100
commit164051a6ab5445bd97f719f50b16db8b32174269 (patch)
treeee8733528ae40c77f0c9b3e43518734ba4b86611 /net/can
parenta79305e156db3d24fcd8eb649cdb3c3b2350e5c2 (diff)
downloadlinux-164051a6ab5445bd97f719f50b16db8b32174269.tar.bz2
can: j1939: j1939_tp_cmd_recv(): check the dst address of TP.CM_BAM
The TP.CM_BAM message must be sent to the global address [1], so add a check to drop TP.CM_BAM sent to a non-global address. Without this patch, the receiver will treat the following packets as normal RTS/CTS transport: 18EC0102#20090002FF002301 18EB0102#0100000000000000 18EB0102#020000FFFFFFFFFF [1] SAE-J1939-82 2015 A.3.3 Row 1. Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol") Link: https://lore.kernel.org/all/1635431907-15617-4-git-send-email-zhangchangzhong@huawei.com Cc: stable@vger.kernel.org Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com> Acked-by: Oleksij Rempel <o.rempel@pengutronix.de> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Diffstat (limited to 'net/can')
-rw-r--r--net/can/j1939/transport.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/net/can/j1939/transport.c b/net/can/j1939/transport.c
index 05eb3d059e17..a271688780a2 100644
--- a/net/can/j1939/transport.c
+++ b/net/can/j1939/transport.c
@@ -2023,6 +2023,11 @@ static void j1939_tp_cmd_recv(struct j1939_priv *priv, struct sk_buff *skb)
extd = J1939_ETP;
fallthrough;
case J1939_TP_CMD_BAM:
+ if (cmd == J1939_TP_CMD_BAM && !j1939_cb_is_broadcast(skcb)) {
+ netdev_err_once(priv->ndev, "%s: BAM to unicast (%02x), ignoring!\n",
+ __func__, skcb->addr.sa);
+ return;
+ }
fallthrough;
case J1939_TP_CMD_RTS:
if (skcb->addr.type != extd)