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can: isotp: recvmsg(): allow MSG_CMSG_COMPAT flag
commitdb2773d65b
upstream. The control message provided by isotp support MSG_CMSG_COMPAT but blocked recvmsg() syscalls that have set this flag, i.e. on 32bit user space on 64 bit kernels. Link: https://github.com/hartkopp/can-isotp/issues/59 Cc: Oleksij Rempel <o.rempel@pengutronix.de> Suggested-by: Marc Kleine-Budde <mkl@pengutronix.de> Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net> Fixes:42bf50a179
("can: isotp: support MSG_TRUNC flag when reading from socket") Link: https://lore.kernel.org/20230505110308.81087-2-mkl@pengutronix.de Cc: stable@vger.kernel.org Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -1106,7 +1106,7 @@ static int isotp_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
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struct isotp_sock *so = isotp_sk(sk);
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int ret = 0;
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if (flags & ~(MSG_DONTWAIT | MSG_TRUNC | MSG_PEEK))
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if (flags & ~(MSG_DONTWAIT | MSG_TRUNC | MSG_PEEK | MSG_CMSG_COMPAT))
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return -EINVAL;
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if (!so->bound)
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