linux-kernel - [PATCH] drm/panfrost: Only put sync

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Message-Id: <20190509082151.8823-1-tomeu.vizoso@collabora.com>
Date:   Thu,  9 May 2019 10:21:51 +0200
From:   Tomeu Vizoso <tomeu.vizoso@...labora.com>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Tomeu Vizoso <tomeu.vizoso@...labora.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Rob Herring <robh@...nel.org>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH] drm/panfrost: Only put sync_out if non-NULL

Dan Carpenter's static analysis tool reported:

drivers/gpu/drm/panfrost/panfrost_drv.c:222 panfrost_ioctl_submit()
error: we previously assumed 'sync_out' could be null (see line 216)

Indeed, sync_out could be NULL if userspace doesn't send a sync object
ID for the out fence.

Signed-off-by: Tomeu Vizoso <tomeu.vizoso@...labora.com>
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Link: https://lists.freedesktop.org/archives/dri-devel/2019-May/217014.html
---
 drivers/gpu/drm/panfrost/panfrost_drv.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/panfrost/panfrost_drv.c b/drivers/gpu/drm/panfrost/panfrost_drv.c
index 94b0819ad50b..d11e2281dde6 100644
--- a/drivers/gpu/drm/panfrost/panfrost_drv.c
+++ b/drivers/gpu/drm/panfrost/panfrost_drv.c
@@ -219,7 +219,8 @@ static int panfrost_ioctl_submit(struct drm_device *dev, void *data,
 fail_job:
 	panfrost_job_put(job);
 fail_out_sync:
-	drm_syncobj_put(sync_out);
+	if (sync_out)
+		drm_syncobj_put(sync_out);
 
 	return ret;
 }
-- 
2.20.1