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From: Jiasheng Jiang <jiasheng@iscas.ac.cn>
To: liviu.dudau@arm.com, brian.starkey@arm.com, airlied@linux.ie,
	daniel@ffwll.ch
Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,
	Jiasheng Jiang <jiasheng@iscas.ac.cn>
Subject: [PATCH v3] drm: mali-dp: potential dereference of null pointer
Date: Tue, 14 Dec 2021 20:53:41 +0800	[thread overview]
Message-ID: <20211214125341.47032-1-jiasheng@iscas.ac.cn> (raw)

The return value of kzalloc() needs to be checked.
To avoid use of null pointer '&state->base' in case of the
failure of alloc.

Fixes: 99665d072183 ("drm: mali-dp: add malidp_crtc_state struct")
Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
Reviewed-by: Brian Starkey <brian.starkey@arm.com>
---
Changelog:

v2 -> v3

*Change 1. Change reported to reviewed.
---
 drivers/gpu/drm/arm/malidp_crtc.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/arm/malidp_crtc.c b/drivers/gpu/drm/arm/malidp_crtc.c
index 494075ddbef6..b5928b52e279 100644
--- a/drivers/gpu/drm/arm/malidp_crtc.c
+++ b/drivers/gpu/drm/arm/malidp_crtc.c
@@ -487,7 +487,10 @@ static void malidp_crtc_reset(struct drm_crtc *crtc)
 	if (crtc->state)
 		malidp_crtc_destroy_state(crtc, crtc->state);
 
-	__drm_atomic_helper_crtc_reset(crtc, &state->base);
+	if (state)
+		__drm_atomic_helper_crtc_reset(crtc, &state->base);
+	else
+		__drm_atomic_helper_crtc_reset(crtc, NULL);
 }
 
 static int malidp_crtc_enable_vblank(struct drm_crtc *crtc)
-- 
2.25.1


WARNING: multiple messages have this Message-ID (diff)
From: Jiasheng Jiang <jiasheng@iscas.ac.cn>
To: liviu.dudau@arm.com, brian.starkey@arm.com, airlied@linux.ie,
	daniel@ffwll.ch
Cc: Jiasheng Jiang <jiasheng@iscas.ac.cn>,
	linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org
Subject: [PATCH v3] drm: mali-dp: potential dereference of null pointer
Date: Tue, 14 Dec 2021 20:53:41 +0800	[thread overview]
Message-ID: <20211214125341.47032-1-jiasheng@iscas.ac.cn> (raw)

The return value of kzalloc() needs to be checked.
To avoid use of null pointer '&state->base' in case of the
failure of alloc.

Fixes: 99665d072183 ("drm: mali-dp: add malidp_crtc_state struct")
Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
Reviewed-by: Brian Starkey <brian.starkey@arm.com>
---
Changelog:

v2 -> v3

*Change 1. Change reported to reviewed.
---
 drivers/gpu/drm/arm/malidp_crtc.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/arm/malidp_crtc.c b/drivers/gpu/drm/arm/malidp_crtc.c
index 494075ddbef6..b5928b52e279 100644
--- a/drivers/gpu/drm/arm/malidp_crtc.c
+++ b/drivers/gpu/drm/arm/malidp_crtc.c
@@ -487,7 +487,10 @@ static void malidp_crtc_reset(struct drm_crtc *crtc)
 	if (crtc->state)
 		malidp_crtc_destroy_state(crtc, crtc->state);
 
-	__drm_atomic_helper_crtc_reset(crtc, &state->base);
+	if (state)
+		__drm_atomic_helper_crtc_reset(crtc, &state->base);
+	else
+		__drm_atomic_helper_crtc_reset(crtc, NULL);
 }
 
 static int malidp_crtc_enable_vblank(struct drm_crtc *crtc)
-- 
2.25.1


             reply	other threads:[~2021-12-14 12:54 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-12-14 12:53 Jiasheng Jiang [this message]
2021-12-14 12:53 ` [PATCH v3] drm: mali-dp: potential dereference of null pointer Jiasheng Jiang

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