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drm/tegra: Fix a possible null pointer dereference

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commit 780351a5f61416ed2ba1199cc57e4a076fca644d upstream.

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: b7e0b04ae4 ("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>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20241106095906.15247-1-chenqiuji666@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Qiu-ji Chen
2024-11-06 17:59:06 +08:00
committed by Greg Kroah-Hartman
parent 23134a5227
commit 5ff3636bcc
1 changed files with 4 additions and 1 deletions
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3
drivers/gpu/drm/tegra/dc.c
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@@ -1392,7 +1392,10 @@ static void tegra_crtc_reset(struct drm_crtc *crtc)
if (crtc->state) if (crtc->state)
tegra_crtc_atomic_destroy_state(crtc, crtc->state); tegra_crtc_atomic_destroy_state(crtc, crtc->state);
if (state)
__drm_atomic_helper_crtc_reset(crtc, &state->base); __drm_atomic_helper_crtc_reset(crtc, &state->base);
else
__drm_atomic_helper_crtc_reset(crtc, NULL);
} }
static struct drm_crtc_state * static struct drm_crtc_state *