[SMBDIRECT][PATCH] missing rc checks while waiting for SMB3 over RDMA events

[Steve French]

    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@xxxxxxxxxxxxx>

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
From 9bf42caeb95d8a5bf672348e5deba583f8233713 Mon Sep 17 00:00:00 2001
From: Steve French <stfrench@xxxxxxxxxxxxx>
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@xxxxxxxxxxxxx>
---
 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