linux-kernel - [PATCH] drm/radeon: fix a potential NULL pointer dereference

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Date:   Wed, 18 Sep 2019 22:01:22 +0530
From:   Allen Pais <allen.pais@...cle.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     airlied@...ux.ie, linux-kernel@...r.kernel.org,
        amd-gfx@...ts.freedesktop.org, daniel@...ll.ch
Subject: [PATCH] drm/radeon: fix a potential NULL pointer dereference

alloc_workqueue is not checked for errors and as a result,
a potential NULL dereference could occur.

Signed-off-by: Allen Pais <allen.pais@...cle.com>
---
 drivers/gpu/drm/radeon/radeon_display.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/radeon/radeon_display.c b/drivers/gpu/drm/radeon/radeon_display.c
index bd52f15..1a41764 100644
--- a/drivers/gpu/drm/radeon/radeon_display.c
+++ b/drivers/gpu/drm/radeon/radeon_display.c
@@ -683,6 +683,10 @@ static void radeon_crtc_init(struct drm_device *dev, int index)
 	drm_mode_crtc_set_gamma_size(&radeon_crtc->base, 256);
 	radeon_crtc->crtc_id = index;
 	radeon_crtc->flip_queue = alloc_workqueue("radeon-crtc", WQ_HIGHPRI, 0);
+	if (unlikely(!radeon_crtc->flip_queue)) {
+		kfree(radeon_crtc);
+		return;
+	}
 	rdev->mode_info.crtcs[index] = radeon_crtc;
 
 	if (rdev->family >= CHIP_BONAIRE) {
-- 
1.9.1