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authorOleksij Rempel <o.rempel@pengutronix.de>2023-05-26 11:19:46 +0300
committerMarc Kleine-Budde <mkl@pengutronix.de>2023-06-05 09:20:36 +0300
commit2a84aea80e925ecba6349090559754f8e8eb68ef (patch)
tree1e60de7e3be3d3eae70e4a6f3e14b184db236d46 /net/can
parent8cde87b007dad2e461015ff70352af56ceb02c75 (diff)
downloadlinux-2a84aea80e925ecba6349090559754f8e8eb68ef.tar.xz
can: j1939: j1939_sk_send_loop_abort(): improved error queue handling in J1939 Socket
This patch addresses an issue within the j1939_sk_send_loop_abort() function in the j1939/socket.c file, specifically in the context of Transport Protocol (TP) sessions. Without this patch, when a TP session is initiated and a Clear To Send (CTS) frame is received from the remote side requesting one data packet, the kernel dispatches the first Data Transport (DT) frame and then waits for the next CTS. If the remote side doesn't respond with another CTS, the kernel aborts due to a timeout. This leads to the user-space receiving an EPOLLERR on the socket, and the socket becomes active. However, when trying to read the error queue from the socket with sock.recvmsg(, , socket.MSG_ERRQUEUE), it returns -EAGAIN, given that the socket is non-blocking. This situation results in an infinite loop: the user-space repeatedly calls epoll(), epoll() returns the socket file descriptor with EPOLLERR, but the socket then blocks on the recv() of ERRQUEUE. This patch introduces an additional check for the J1939_SOCK_ERRQUEUE flag within the j1939_sk_send_loop_abort() function. If the flag is set, it indicates that the application has subscribed to receive error queue messages. In such cases, the kernel can communicate the current transfer state via the error queue. This allows for the function to return early, preventing the unnecessary setting of the socket into an error state, and breaking the infinite loop. It is crucial to note that a socket error is only needed if the application isn't using the error queue, as, without it, the application wouldn't be aware of transfer issues. Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol") Reported-by: David Jander <david@protonic.nl> Tested-by: David Jander <david@protonic.nl> Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de> Link: https://lore.kernel.org/r/20230526081946.715190-1-o.rempel@pengutronix.de Cc: stable@vger.kernel.org Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Diffstat (limited to 'net/can')
-rw-r--r--net/can/j1939/socket.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/net/can/j1939/socket.c b/net/can/j1939/socket.c
index 1790469b2580..35970c25496a 100644
--- a/net/can/j1939/socket.c
+++ b/net/can/j1939/socket.c
@@ -1088,6 +1088,11 @@ void j1939_sk_errqueue(struct j1939_session *session,
void j1939_sk_send_loop_abort(struct sock *sk, int err)
{
+ struct j1939_sock *jsk = j1939_sk(sk);
+
+ if (jsk->state & J1939_SOCK_ERRQUEUE)
+ return;
+
sk->sk_err = err;
sk_error_report(sk);