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| author | Maxime Ripard <maxime@cerno.tech> | 2021-11-17 12:45:23 +0300 |
|---|---|---|
| committer | Maxime Ripard <maxime@cerno.tech> | 2021-11-29 17:17:51 +0300 |
| commit | f927767978d201d4ac023fcd797adbb963a6565d (patch) | |
| tree | 89f639ee57dedacc1cacc7e88d5ca6281cc7bf8e /drivers/gpu | |
| parent | 0c980a006d3fbee86c4d0698f66d6f5381831787 (diff) | |
| download | linux-f927767978d201d4ac023fcd797adbb963a6565d.tar.xz | |
drm/vc4: kms: Fix return code check
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>
Reviewed-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Tested-by: Jian-Hong Pan <jhp@endlessos.org>
Link: https://lore.kernel.org/r/20211117094527.146275-3-maxime@cerno.tech
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/vc4/vc4_kms.c | 10 |
1 files 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) |