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From: Dan Carpenter <dan.carpenter@oracle.com>
To: "James (Qian) Wang" <james.qian.wang@arm.com>
Cc: David Airlie <airlied@linux.ie>,
	Liviu Dudau <liviu.dudau@arm.com>,
	kernel-janitors@vger.kernel.org, dri-devel@lists.freedesktop.org
Subject: [PATCH] drm/komeda: Potential error pointer dereference
Date: Fri, 03 May 2019 12:25:25 +0000	[thread overview]
Message-ID: <20190503122525.GA29695@mwanda> (raw)

We need to check whether drm_atomic_get_crtc_state() returns an error
pointer before dereferencing "crtc_st".

Fixes: 7d31b9e7a550 ("drm/komeda: Add komeda_plane/plane_helper_funcs")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
 drivers/gpu/drm/arm/display/komeda/komeda_plane.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_plane.c b/drivers/gpu/drm/arm/display/komeda/komeda_plane.c
index 07ed0cc1bc44..c7e5fc6e5500 100644
--- a/drivers/gpu/drm/arm/display/komeda/komeda_plane.c
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_plane.c
@@ -64,7 +64,7 @@ komeda_plane_atomic_check(struct drm_plane *plane,
 		return 0;
 
 	crtc_st = drm_atomic_get_crtc_state(state->state, state->crtc);
-	if (!crtc_st->enable) {
+	if (IS_ERR(crtc_st) || !crtc_st->enable) {
 		DRM_DEBUG_ATOMIC("Cannot update plane on a disabled CRTC.\n");
 		return -EINVAL;
 	}
-- 
2.18.0

WARNING: multiple messages have this Message-ID (diff)
From: Dan Carpenter <dan.carpenter@oracle.com>
To: "James (Qian) Wang" <james.qian.wang@arm.com>
Cc: David Airlie <airlied@linux.ie>,
	Liviu Dudau <liviu.dudau@arm.com>,
	kernel-janitors@vger.kernel.org, dri-devel@lists.freedesktop.org
Subject: [PATCH] drm/komeda: Potential error pointer dereference
Date: Fri, 3 May 2019 15:25:25 +0300	[thread overview]
Message-ID: <20190503122525.GA29695@mwanda> (raw)

We need to check whether drm_atomic_get_crtc_state() returns an error
pointer before dereferencing "crtc_st".

Fixes: 7d31b9e7a550 ("drm/komeda: Add komeda_plane/plane_helper_funcs")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
 drivers/gpu/drm/arm/display/komeda/komeda_plane.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_plane.c b/drivers/gpu/drm/arm/display/komeda/komeda_plane.c
index 07ed0cc1bc44..c7e5fc6e5500 100644
--- a/drivers/gpu/drm/arm/display/komeda/komeda_plane.c
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_plane.c
@@ -64,7 +64,7 @@ komeda_plane_atomic_check(struct drm_plane *plane,
 		return 0;
 
 	crtc_st = drm_atomic_get_crtc_state(state->state, state->crtc);
-	if (!crtc_st->enable) {
+	if (IS_ERR(crtc_st) || !crtc_st->enable) {
 		DRM_DEBUG_ATOMIC("Cannot update plane on a disabled CRTC.\n");
 		return -EINVAL;
 	}
-- 
2.18.0

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             reply	other threads:[~2019-05-03 12:25 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-03 12:25 Dan Carpenter [this message]
2019-05-03 12:25 ` [PATCH] drm/komeda: Potential error pointer dereference Dan Carpenter
2019-05-03 14:41 ` Liviu Dudau
2019-05-03 14:41   ` Liviu Dudau
2019-05-20  5:37 ` james qian wang (Arm Technology China)
2019-05-20  5:37   ` james qian wang (Arm Technology China)
2019-05-20  5:43 ` james qian wang (Arm Technology China)
2019-05-20  5:43   ` james qian wang (Arm Technology China)

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