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net/smc: Keep smc_close_final rc during active close
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commit 00e158f upstream.

When smc_close_final() returns error, the return code overwrites by
kernel_sock_shutdown() in smc_close_active(). The return code of
smc_close_final() is more important than kernel_sock_shutdown(), and it
will pass to userspace directly.

Fix it by keeping both return codes, if smc_close_final() raises an
error, return it or kernel_sock_shutdown()'s.

Link: https://lore.kernel.org/linux-s390/1f67548e-cbf6-0dce-82b5-10288a4583bd@linux.ibm.com/
Fixes: 606a63c ("net/smc: Ensure the active closing peer first closes clcsock")
Suggested-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: Tony Lu <tonylu@linux.alibaba.com>
Reviewed-by: Wen Gu <guwen@linux.alibaba.com>
Acked-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Tony Lu authored and gregkh committed Dec 8, 2021
1 parent b44a55e commit 3a3db12
Showing 1 changed file with 6 additions and 2 deletions.
8 changes: 6 additions & 2 deletions net/smc/smc_close.c
Original file line number Diff line number Diff line change
Expand Up @@ -195,6 +195,7 @@ int smc_close_active(struct smc_sock *smc)
int old_state;
long timeout;
int rc = 0;
int rc1 = 0;

timeout = current->flags & PF_EXITING ?
0 : sock_flag(sk, SOCK_LINGER) ?
Expand Down Expand Up @@ -232,8 +233,11 @@ int smc_close_active(struct smc_sock *smc)
/* actively shutdown clcsock before peer close it,
* prevent peer from entering TIME_WAIT state.
*/
if (smc->clcsock && smc->clcsock->sk)
rc = kernel_sock_shutdown(smc->clcsock, SHUT_RDWR);
if (smc->clcsock && smc->clcsock->sk) {
rc1 = kernel_sock_shutdown(smc->clcsock,
SHUT_RDWR);
rc = rc ? rc : rc1;
}
} else {
/* peer event has changed the state */
goto again;
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