From: Carsten Haitzler carsten.haitzler@arm.com
[ Upstream commit be3e477effba636ad25dcd244db264c6cd5c1f36 ]
KASAN found this problem. find_first_bit() expects to look at a pointer pointing to a long, but we look at a u32 - this is going to be an issue with endianness but, KSAN already flags this as out-of-bounds stack reads. This fixes it by just importing inot a local long.
Signed-off-by: Carsten Haitzler carsten.haitzler@arm.com Acked-by: Liviu Dudau liviu.dudau@arm.com Signed-off-by: Liviu Dudau liviu.dudau@arm.com Link: https://patchwork.freedesktop.org/patch/msgid/20201218150812.68195-1-carsten... Signed-off-by: Sasha Levin sashal@kernel.org --- .../drm/arm/display/include/malidp_utils.h | 3 --- .../drm/arm/display/komeda/komeda_pipeline.c | 16 +++++++++++----- .../display/komeda/komeda_pipeline_state.c | 19 +++++++++++-------- 3 files changed, 22 insertions(+), 16 deletions(-)
diff --git a/drivers/gpu/drm/arm/display/include/malidp_utils.h b/drivers/gpu/drm/arm/display/include/malidp_utils.h index 3bc383d5bf73..49a1d7f3539c 100644 --- a/drivers/gpu/drm/arm/display/include/malidp_utils.h +++ b/drivers/gpu/drm/arm/display/include/malidp_utils.h @@ -13,9 +13,6 @@ #define has_bit(nr, mask) (BIT(nr) & (mask)) #define has_bits(bits, mask) (((bits) & (mask)) == (bits))
-#define dp_for_each_set_bit(bit, mask) \ - for_each_set_bit((bit), ((unsigned long *)&(mask)), sizeof(mask) * 8) - #define dp_wait_cond(__cond, __tries, __min_range, __max_range) \ ({ \ int num_tries = __tries; \ diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_pipeline.c b/drivers/gpu/drm/arm/display/komeda/komeda_pipeline.c index 452e505a1fd3..79a6339840bb 100644 --- a/drivers/gpu/drm/arm/display/komeda/komeda_pipeline.c +++ b/drivers/gpu/drm/arm/display/komeda/komeda_pipeline.c @@ -46,8 +46,9 @@ void komeda_pipeline_destroy(struct komeda_dev *mdev, { struct komeda_component *c; int i; + unsigned long avail_comps = pipe->avail_comps;
- dp_for_each_set_bit(i, pipe->avail_comps) { + for_each_set_bit(i, &avail_comps, 32) { c = komeda_pipeline_get_component(pipe, i); komeda_component_destroy(mdev, c); } @@ -246,6 +247,7 @@ static void komeda_pipeline_dump(struct komeda_pipeline *pipe) { struct komeda_component *c; int id; + unsigned long avail_comps = pipe->avail_comps;
DRM_INFO("Pipeline-%d: n_layers: %d, n_scalers: %d, output: %s.\n", pipe->id, pipe->n_layers, pipe->n_scalers, @@ -257,7 +259,7 @@ static void komeda_pipeline_dump(struct komeda_pipeline *pipe) pipe->of_output_links[1] ? pipe->of_output_links[1]->full_name : "none");
- dp_for_each_set_bit(id, pipe->avail_comps) { + for_each_set_bit(id, &avail_comps, 32) { c = komeda_pipeline_get_component(pipe, id);
komeda_component_dump(c); @@ -269,8 +271,9 @@ static void komeda_component_verify_inputs(struct komeda_component *c) struct komeda_pipeline *pipe = c->pipeline; struct komeda_component *input; int id; + unsigned long supported_inputs = c->supported_inputs;
- dp_for_each_set_bit(id, c->supported_inputs) { + for_each_set_bit(id, &supported_inputs, 32) { input = komeda_pipeline_get_component(pipe, id); if (!input) { c->supported_inputs &= ~(BIT(id)); @@ -301,8 +304,9 @@ static void komeda_pipeline_assemble(struct komeda_pipeline *pipe) struct komeda_component *c; struct komeda_layer *layer; int i, id; + unsigned long avail_comps = pipe->avail_comps;
- dp_for_each_set_bit(id, pipe->avail_comps) { + for_each_set_bit(id, &avail_comps, 32) { c = komeda_pipeline_get_component(pipe, id); komeda_component_verify_inputs(c); } @@ -354,13 +358,15 @@ void komeda_pipeline_dump_register(struct komeda_pipeline *pipe, { struct komeda_component *c; u32 id; + unsigned long avail_comps;
seq_printf(sf, "\n======== Pipeline-%d ==========\n", pipe->id);
if (pipe->funcs && pipe->funcs->dump_register) pipe->funcs->dump_register(pipe, sf);
- dp_for_each_set_bit(id, pipe->avail_comps) { + avail_comps = pipe->avail_comps; + for_each_set_bit(id, &avail_comps, 32) { c = komeda_pipeline_get_component(pipe, id);
seq_printf(sf, "\n------%s------\n", c->name); diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_pipeline_state.c b/drivers/gpu/drm/arm/display/komeda/komeda_pipeline_state.c index 8f32ae7c25d0..c3cdf283ecef 100644 --- a/drivers/gpu/drm/arm/display/komeda/komeda_pipeline_state.c +++ b/drivers/gpu/drm/arm/display/komeda/komeda_pipeline_state.c @@ -1231,14 +1231,15 @@ komeda_pipeline_unbound_components(struct komeda_pipeline *pipe, struct komeda_pipeline_state *old = priv_to_pipe_st(pipe->obj.state); struct komeda_component_state *c_st; struct komeda_component *c; - u32 disabling_comps, id; + u32 id; + unsigned long disabling_comps;
WARN_ON(!old);
disabling_comps = (~new->active_comps) & old->active_comps;
/* unbound all disabling component */ - dp_for_each_set_bit(id, disabling_comps) { + for_each_set_bit(id, &disabling_comps, 32) { c = komeda_pipeline_get_component(pipe, id); c_st = komeda_component_get_state_and_set_user(c, drm_st, NULL, new->crtc); @@ -1286,7 +1287,8 @@ bool komeda_pipeline_disable(struct komeda_pipeline *pipe, struct komeda_pipeline_state *old; struct komeda_component *c; struct komeda_component_state *c_st; - u32 id, disabling_comps = 0; + u32 id; + unsigned long disabling_comps;
old = komeda_pipeline_get_old_state(pipe, old_state);
@@ -1296,10 +1298,10 @@ bool komeda_pipeline_disable(struct komeda_pipeline *pipe, disabling_comps = old->active_comps & pipe->standalone_disabled_comps;
- DRM_DEBUG_ATOMIC("PIPE%d: active_comps: 0x%x, disabling_comps: 0x%x.\n", + DRM_DEBUG_ATOMIC("PIPE%d: active_comps: 0x%x, disabling_comps: 0x%lx.\n", pipe->id, old->active_comps, disabling_comps);
- dp_for_each_set_bit(id, disabling_comps) { + for_each_set_bit(id, &disabling_comps, 32) { c = komeda_pipeline_get_component(pipe, id); c_st = priv_to_comp_st(c->obj.state);
@@ -1330,16 +1332,17 @@ void komeda_pipeline_update(struct komeda_pipeline *pipe, struct komeda_pipeline_state *new = priv_to_pipe_st(pipe->obj.state); struct komeda_pipeline_state *old; struct komeda_component *c; - u32 id, changed_comps = 0; + u32 id; + unsigned long changed_comps;
old = komeda_pipeline_get_old_state(pipe, old_state);
changed_comps = new->active_comps | old->active_comps;
- DRM_DEBUG_ATOMIC("PIPE%d: active_comps: 0x%x, changed: 0x%x.\n", + DRM_DEBUG_ATOMIC("PIPE%d: active_comps: 0x%x, changed: 0x%lx.\n", pipe->id, new->active_comps, changed_comps);
- dp_for_each_set_bit(id, changed_comps) { + for_each_set_bit(id, &changed_comps, 32) { c = komeda_pipeline_get_component(pipe, id);
if (new->active_comps & BIT(c->id))