tools: hv: Check return value of setsockopt call

Check return value of setsockopt call and if it fails print error
to the system log and exit with non-zero value.

Signed-off-by: Tomas Hozza <thozza@redhat.com>
Acked-by:  K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 7 insertions, 1 deletions

diff --git a/tools/hv/hv_kvp_daemon.c b/tools/hv/hv_kvp_daemon.c
index 5a1f6489d185..ae9aa1cd97fe 100644
--- a/tools/hv/hv_kvp_daemon.c
+++ b/tools/hv/hv_kvp_daemon.c
@@ -1457,7 +1457,13 @@ int main(void)
                 exit(EXIT_FAILURE);
         }
         nl_group = CN_KVP_IDX;
-        setsockopt(fd, SOL_NETLINK, NETLINK_ADD_MEMBERSHIP, &nl_group, sizeof(nl_group));
+
+        if (setsockopt(fd, SOL_NETLINK, NETLINK_ADD_MEMBERSHIP, &nl_group, sizeof(nl_group)) < 0) {
+                syslog(LOG_ERR, "setsockopt failed; error: %d %s", errno, strerror(errno));
+                close(fd);
+                exit(EXIT_FAILURE);
+        }
+
         /*
          * Register ourselves with the kernel.
          */