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[17/72] libmultipath: uevent_listen(): fix poll() retval check

Message ID 20191012212703.12989-18-martin.wilck@suse.com (mailing list archive)
State Not Applicable, archived
Delegated to: christophe varoqui
Headers show
Series multipath-tools: cleanup and warning enablement | expand

Commit Message

Martin Wilck Oct. 12, 2019, 9:27 p.m. UTC 
From: Martin Wilck <mwilck@suse.com>

Only check revents if poll() returns a positive value.

Signed-off-by: Martin Wilck <mwilck@suse.com>
---
 libmultipath/uevent.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/libmultipath/uevent.c b/libmultipath/uevent.c
index 8f7b2ef5..f128ced2 100644
--- a/libmultipath/uevent.c
+++ b/libmultipath/uevent.c
@@ -853,7 +853,7 @@  int uevent_listen(struct udev *udev)
 		poll_timeout = timeout * 1000;
 		errno = 0;
 		fdcount = poll(&ev_poll, 1, poll_timeout);
-		if (fdcount && ev_poll.revents & POLLIN) {
+		if (fdcount > 0 && ev_poll.revents & POLLIN) {
 			timeout = uevent_burst(&start_time, events + 1) ? 1 : 0;
 			dev = udev_monitor_receive_device(monitor);
 			if (!dev) {