From: Stefan Raspl <raspl@linux.ibm.com>
Subject: net/smc: use announced length in sock_recvmsg()
Patch-mainline: v4.16
Git-commit: ab6f6dd18ab801fcbbaa05fb5401e91f48778e04
References: FATE#325694, LTC#167874, bsc#1113480
Summary: net/smc: SMC-R MVP
Description: Add latest upstream patches to push SMC-R to the MVP level
Upstream-Description:
net/smc: use announced length in sock_recvmsg()
Not every CLC proposal message needs the maximum buffer length.
Due to the MSG_WAITALL flag, it is important to use the peeked
real length when receiving the message.
Fixes: d63d271ce2b5ce ("smc: switch to sock_recvmsg()")
Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Stefan Raspl <raspl@linux.ibm.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
net/smc/smc_clc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/net/smc/smc_clc.c
+++ b/net/smc/smc_clc.c
@@ -132,7 +132,7 @@ int smc_clc_wait_msg(struct smc_sock *sm
/* receive the complete CLC message */
memset(&msg, 0, sizeof(struct msghdr));
- iov_iter_kvec(&msg.msg_iter, READ | ITER_KVEC, &vec, 1, buflen);
+ iov_iter_kvec(&msg.msg_iter, READ | ITER_KVEC, &vec, 1, datlen);
krflags = MSG_WAITALL;
smc->clcsock->sk->sk_rcvtimeo = CLC_WAIT_TIME;
len = sock_recvmsg(smc->clcsock, &msg, krflags);