From: Qiu-ji Chen <chenqiuji666@gmail.com>
To: thierry.reding@gmail.com, mperttunen@nvidia.com,
airlied@gmail.com, simona@ffwll.ch, jonathanh@nvidia.com
Cc: dri-devel@lists.freedesktop.org, linux-tegra@vger.kernel.org,
linux-kernel@vger.kernel.org, baijiaju1990@gmail.com,
Qiu-ji Chen <chenqiuji666@gmail.com>,
stable@vger.kernel.org
Subject: [PATCH RESEND] drm/tegra: fix a possible null pointer dereference
Date: Wed, 12 Feb 2025 09:42:45 +0800 [thread overview]
Message-ID: <20250212014245.908-1-chenqiuji666@gmail.com> (raw)
In tegra_crtc_reset(), new memory is allocated with kzalloc(), but
no check is performed. Before calling __drm_atomic_helper_crtc_reset,
state should be checked to prevent possible null pointer dereference.
Fixes: b7e0b04ae450 ("drm/tegra: Convert to using __drm_atomic_helper_crtc_reset() for reset.")
Cc: stable@vger.kernel.org
Signed-off-by: Qiu-ji Chen <chenqiuji666@gmail.com>
---
drivers/gpu/drm/tegra/dc.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/tegra/dc.c b/drivers/gpu/drm/tegra/dc.c
index be61c9d1a4f0..1ed30853bd9e 100644
--- a/drivers/gpu/drm/tegra/dc.c
+++ b/drivers/gpu/drm/tegra/dc.c
@@ -1388,7 +1388,10 @@ static void tegra_crtc_reset(struct drm_crtc *crtc)
if (crtc->state)
tegra_crtc_atomic_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 struct drm_crtc_state *
--
2.34.1
next reply other threads:[~2025-02-12 1:43 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-02-12 1:42 Qiu-ji Chen [this message]
2025-05-07 16:08 ` [PATCH RESEND] drm/tegra: fix a possible null pointer dereference Thierry Reding
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