6.12-stable review patch. If anyone has any objections, please let me know.
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From: Qiu-ji Chen chenqiuji666@gmail.com
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: 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 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 --- drivers/gpu/drm/tegra/dc.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
--- a/drivers/gpu/drm/tegra/dc.c +++ b/drivers/gpu/drm/tegra/dc.c @@ -1392,7 +1392,10 @@ static void tegra_crtc_reset(struct drm_ 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 *