We should warn user-space that it is doing something wrong when trying to
activate sessions with identical parameters but WARN_ON_ONCE macro can not
be used here as it serves a different purpose.
Found by Linux Verification Center (linuxtesting.org) with Syzkaller.
Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol")
Signed-off-by: Fedor Pchelkin <pchelkin@xxxxxxxxx>
Signed-off-by: Alexey Khoroshilov <khoroshilov@xxxxxxxxx>
---
net/can/j1939/socket.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/net/can/j1939/socket.c b/net/can/j1939/socket.c
index f5ecfdcf57b2..67e8b50b8bc1 100644
--- a/net/can/j1939/socket.c
+++ b/net/can/j1939/socket.c
@@ -178,7 +178,8 @@ static void j1939_sk_queue_activate_next_locked(struct j1939_session *session)
if (!first)
return;
- if (WARN_ON_ONCE(j1939_session_activate(first))) {
+ if (j1939_session_activate(first)) {
+ pr_warn_once("can: j1939: Identical session is already activated.\n");
first->err = -EBUSY;
goto activate_next;
} else {
--
2.25.1
