From: Huai-Yuan Liu <qq810974084@gmail.com>
To: liviu.dudau@arm.com, maarten.lankhorst@linux.intel.com,
mripard@kernel.org, tzimmermann@suse.de, airlied@gmail.com,
daniel@ffwll.ch
Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,
baijiaju1990@outlook.com, Huai-Yuan Liu <qq810974084@gmail.com>
Subject: [PATCH] drm/arm/malidp: fix a possible null pointer dereference
Date: Wed, 3 Apr 2024 09:43:01 +0800 [thread overview]
Message-ID: <20240403014301.969988-1-qq810974084@gmail.com> (raw)
In malidp_mw_connector_reset, new memory is allocated with kzalloc, but
no check is performed. In order to prevent null pointer dereferencing,
ensure that mw_state is checked before calling
__drm_atomic_helper_connector_reset.
Fixes: 8cbc5caf36ef ("drm: mali-dp: Add writeback connector")
Signed-off-by: Huai-Yuan Liu <qq810974084@gmail.com>
---
drivers/gpu/drm/arm/malidp_mw.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/arm/malidp_mw.c b/drivers/gpu/drm/arm/malidp_mw.c
index 626709bec6f5..25623ef9be80 100644
--- a/drivers/gpu/drm/arm/malidp_mw.c
+++ b/drivers/gpu/drm/arm/malidp_mw.c
@@ -72,7 +72,9 @@ static void malidp_mw_connector_reset(struct drm_connector *connector)
__drm_atomic_helper_connector_destroy_state(connector->state);
kfree(connector->state);
- __drm_atomic_helper_connector_reset(connector, &mw_state->base);
+
+ if (mw_state)
+ __drm_atomic_helper_connector_reset(connector, &mw_state->base);
}
static enum drm_connector_status
--
2.34.1
next reply other threads:[~2024-04-03 1:43 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-03 1:43 Huai-Yuan Liu [this message]
2024-04-03 12:13 ` [PATCH] drm/arm/malidp: fix a possible null pointer dereference Liviu Dudau
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