The HVS global state functions return an error pointer, but in most cases we check if it's NULL, possibly resulting in an invalid pointer dereference.
Fixes: 9ec03d7f1ed3 ("drm/vc4: kms: Wait on previous FIFO users before a commit") Signed-off-by: Maxime Ripard maxime@cerno.tech --- drivers/gpu/drm/vc4/vc4_kms.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/vc4/vc4_kms.c b/drivers/gpu/drm/vc4/vc4_kms.c index 764ddb41a4ce..3f780c195749 100644 --- a/drivers/gpu/drm/vc4/vc4_kms.c +++ b/drivers/gpu/drm/vc4/vc4_kms.c @@ -354,7 +354,7 @@ static void vc4_atomic_commit_tail(struct drm_atomic_state *state) }
old_hvs_state = vc4_hvs_get_old_global_state(state); - if (!old_hvs_state) + if (IS_ERR(old_hvs_state)) return;
for_each_old_crtc_in_state(state, crtc, old_crtc_state, i) { @@ -410,8 +410,8 @@ static int vc4_atomic_commit_setup(struct drm_atomic_state *state) unsigned int i;
hvs_state = vc4_hvs_get_new_global_state(state); - if (!hvs_state) - return -EINVAL; + if (WARN_ON(IS_ERR(hvs_state))) + return PTR_ERR(hvs_state);
for_each_new_crtc_in_state(state, crtc, crtc_state, i) { struct vc4_crtc_state *vc4_crtc_state = @@ -762,8 +762,8 @@ static int vc4_pv_muxing_atomic_check(struct drm_device *dev, unsigned int i;
hvs_new_state = vc4_hvs_get_global_state(state); - if (!hvs_new_state) - return -EINVAL; + if (IS_ERR(hvs_new_state)) + return PTR_ERR(hvs_new_state);
for (i = 0; i < ARRAY_SIZE(hvs_new_state->fifo_state); i++) if (!hvs_new_state->fifo_state[i].in_use)