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From: Steve French <smfrench@gmail.com>
To: Long Li <longli@microsoft.com>
Cc: CIFS <linux-cifs@vger.kernel.org>, LKML <linux-kernel@vger.kernel.org>
Subject: [SMBDIRECT][PATCH] missing rc checks while waiting for SMB3 over RDMA events
Date: Mon, 21 Jun 2021 16:32:00 -0500	[thread overview]
Message-ID: <CAH2r5msOSLaZT42-jFMjJrB1YiYTZBzdM18ieqQY2v=YwXzcrA@mail.gmail.com> (raw)

[-- Attachment #1: Type: text/plain, Size: 1586 bytes --]

    There were two places where we weren't checking for error
    (e.g. ERESTARTSYS) while waiting for rdma resolution.

    Addresses-Coverity: 1462165 ("Unchecked return value")
   Signed-off-by: Steve French <stfrench@microsoft.com>

diff --git a/fs/cifs/smbdirect.c b/fs/cifs/smbdirect.c
index 10dfe5006792..ae07732f750f 100644
--- a/fs/cifs/smbdirect.c
+++ b/fs/cifs/smbdirect.c
@@ -572,8 +572,11 @@ static struct rdma_cm_id *smbd_create_id(
                log_rdma_event(ERR, "rdma_resolve_addr() failed %i\n", rc);
                goto out;
        }
-       wait_for_completion_interruptible_timeout(
+       rc = wait_for_completion_interruptible_timeout(
                &info->ri_done, msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT));
+       /* -ERESTARTSYS, returned when interrupted, is the only rc mentioned */
+       if (rc < 0)
+               goto out;
        rc = info->ri_rc;
        if (rc) {
                log_rdma_event(ERR, "rdma_resolve_addr() completed %i\n", rc);
@@ -586,8 +589,10 @@ static struct rdma_cm_id *smbd_create_id(
                log_rdma_event(ERR, "rdma_resolve_route() failed %i\n", rc);
                goto out;
        }
-       wait_for_completion_interruptible_timeout(
+       rc = wait_for_completion_interruptible_timeout(
                &info->ri_done, msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT));
+       if (rc < 0)  /* e.g. if interrupted and returns -ERESTARTSYS */
+               goto out
        rc = info->ri_rc;
        if (rc) {
                log_rdma_event(ERR, "rdma_resolve_route() completed %i\n", rc);


-- 
Thanks,

Steve

[-- Attachment #2: 0001-smbdirect-missing-rc-checks-while-waiting-for-rdma-e.patch --]
[-- Type: text/x-patch, Size: 1672 bytes --]

From 9bf42caeb95d8a5bf672348e5deba583f8233713 Mon Sep 17 00:00:00 2001
From: Steve French <stfrench@microsoft.com>
Date: Mon, 21 Jun 2021 16:25:20 -0500
Subject: [PATCH] smbdirect: missing rc checks while waiting for rdma events

There were two places where we weren't checking for error
(e.g. ERESTARTSYS) while waiting for rdma resolution.

Addresses-Coverity: 1462165 ("Unchecked return value")
Signed-off-by: Steve French <stfrench@microsoft.com>
---
 fs/cifs/smbdirect.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/fs/cifs/smbdirect.c b/fs/cifs/smbdirect.c
index 10dfe5006792..ae07732f750f 100644
--- a/fs/cifs/smbdirect.c
+++ b/fs/cifs/smbdirect.c
@@ -572,8 +572,11 @@ static struct rdma_cm_id *smbd_create_id(
 		log_rdma_event(ERR, "rdma_resolve_addr() failed %i\n", rc);
 		goto out;
 	}
-	wait_for_completion_interruptible_timeout(
+	rc = wait_for_completion_interruptible_timeout(
 		&info->ri_done, msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT));
+	/* -ERESTARTSYS, returned when interrupted, is the only rc mentioned */
+	if (rc < 0)
+		goto out;
 	rc = info->ri_rc;
 	if (rc) {
 		log_rdma_event(ERR, "rdma_resolve_addr() completed %i\n", rc);
@@ -586,8 +589,10 @@ static struct rdma_cm_id *smbd_create_id(
 		log_rdma_event(ERR, "rdma_resolve_route() failed %i\n", rc);
 		goto out;
 	}
-	wait_for_completion_interruptible_timeout(
+	rc = wait_for_completion_interruptible_timeout(
 		&info->ri_done, msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT));
+	if (rc < 0)  /* e.g. if interrupted and returns -ERESTARTSYS */
+		goto out
 	rc = info->ri_rc;
 	if (rc) {
 		log_rdma_event(ERR, "rdma_resolve_route() completed %i\n", rc);
-- 
2.30.2


             reply	other threads:[~2021-06-21 21:32 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-21 21:32 Steve French [this message]
2021-06-22  6:49 ` [SMBDIRECT][PATCH] missing rc checks while waiting for SMB3 over RDMA events Long Li
2021-06-22 15:18 ` Tom Talpey
2021-06-22 17:09   ` Steve French

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