From: Oliver Hartkopp Date: Mon, 28 Mar 2022 11:36:11 +0000 (+0200) Subject: can: isotp: restore accidentally removed MSG_PEEK feature X-Git-Tag: v6.6.17~7844^2~2^2~7 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=e382fea8ae54f5bb62869c6b69b33993d43adeca;p=platform%2Fkernel%2Flinux-rpi.git can: isotp: restore accidentally removed MSG_PEEK feature In commit 42bf50a1795a ("can: isotp: support MSG_TRUNC flag when reading from socket") a new check for recvmsg flags has been introduced that only checked for the flags that are handled in isotp_recvmsg() itself. This accidentally removed the MSG_PEEK feature flag which is processed later in the call chain in __skb_try_recv_from_queue(). Add MSG_PEEK to the set of valid flags to restore the feature. Fixes: 42bf50a1795a ("can: isotp: support MSG_TRUNC flag when reading from socket") Link: https://github.com/linux-can/can-utils/issues/347#issuecomment-1079554254 Link: https://lore.kernel.org/all/20220328113611.3691-1-socketcan@hartkopp.net Reported-by: Derek Will Suggested-by: Derek Will Tested-by: Derek Will Signed-off-by: Oliver Hartkopp Signed-off-by: Marc Kleine-Budde --- diff --git a/net/can/isotp.c b/net/can/isotp.c index f6f8ba1f..bafb0fb 100644 --- a/net/can/isotp.c +++ b/net/can/isotp.c @@ -1050,7 +1050,7 @@ static int isotp_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, int noblock = flags & MSG_DONTWAIT; int ret = 0; - if (flags & ~(MSG_DONTWAIT | MSG_TRUNC)) + if (flags & ~(MSG_DONTWAIT | MSG_TRUNC | MSG_PEEK)) return -EINVAL; if (!so->bound)