Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 4.19 35/48] net/smc: Keep smc_close_final rc during active close | Date | Mon, 6 Dec 2021 15:56:52 +0100 |
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From: Tony Lu <tonylu@linux.alibaba.com>
commit 00e158fb91dfaff3f94746f260d11f1a4853506e 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: 606a63c9783a ("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> --- net/smc/smc_close.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)
--- a/net/smc/smc_close.c +++ b/net/smc/smc_close.c @@ -167,6 +167,7 @@ int smc_close_active(struct smc_sock *sm int old_state; long timeout; int rc = 0; + int rc1 = 0; timeout = current->flags & PF_EXITING ? 0 : sock_flag(sk, SOCK_LINGER) ? @@ -206,8 +207,11 @@ again: /* 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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