| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.10 571/599] can: isotp: restore accidentally removed MSG_PEEK feature | Date | Tue, 5 Apr 2022 09:34:25 +0200 |
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From: Oliver Hartkopp <socketcan@hartkopp.net>
[ Upstream commit e382fea8ae54f5bb62869c6b69b33993d43adeca ]
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 <derekrobertwill@gmail.com> Suggested-by: Derek Will <derekrobertwill@gmail.com> Tested-by: Derek Will <derekrobertwill@gmail.com> Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de> Signed-off-by: Sasha Levin <sashal@kernel.org> --- net/can/isotp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/can/isotp.c b/net/can/isotp.c index 671c3673b7ea..63e6e8923200 100644 --- a/net/can/isotp.c +++ b/net/can/isotp.c @@ -1007,7 +1007,7 @@ 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) -- 2.34.1
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