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net/smc: fix shutdown in state SMC_LISTEN 

[ Upstream commit 1255fcb2a6 ]

Calling shutdown with SHUT_RD and SHUT_RDWR for a listening SMC socket
crashes, because
   commit 127f497058 ("net/smc: release clcsock from tcp_listen_worker")
releases the internal clcsock in smc_close_active() and sets smc->clcsock
to NULL.
For SHUT_RD the smc_close_active() call is removed.
For SHUT_RDWR the kernel_sock_shutdown() call is omitted, since the
clcsock is already released.

Fixes: 127f497058 ("net/smc: release clcsock from tcp_listen_worker")
Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Reported-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/10/head
Ursula Braun 2018-04-19 15:56:40 +02:00 committed by Greg Kroah-Hartman
parent 7b4f4d759c
commit 07cb0b54d7
1 changed files with 4 additions and 6 deletions
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10
net/smc/af_smc.c
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@ -1203,14 +1203,12 @@ static int smc_shutdown(struct socket *sock, int how)
rc = smc_close_shutdown_write(smc);
break;
case SHUT_RD:
if (sk->sk_state == SMC_LISTEN)
rc = smc_close_active(smc);
else
rc = 0;
/* nothing more to do because peer is not involved */
rc = 0;
/* nothing more to do because peer is not involved */
break;
}
rc1 = kernel_sock_shutdown(smc->clcsock, how);
if (smc->clcsock)
rc1 = kernel_sock_shutdown(smc->clcsock, how);
/* map sock_shutdown_cmd constants to sk_shutdown value range */
sk->sk_shutdown |= how + 1;