+CC the other Komeda maintainers

On 04/02/2021 13:11, carsten.haitz...@foss.arm.com wrote:
From: Carsten Haitzler <carsten.haitz...@arm.com>

Another issue found by KASAN. The bit finding is buried inside the
dp_for_each_set_bit() macro (that passes on to for_each_set_bit() that
calls the bit stuff. These bit functions want an unsigned long pointer
as input and just dumbly casting leads to out-of-bounds accesses.
This fixes that.

Signed-off-by: Carsten Haitzler <carsten.haitz...@arm.com>

Looks fine to me:

Reviewed-by: Steven Price <steven.pr...@arm.com>

---
  .../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 719a79728e24..06c595378dda 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);
        }
@@ -247,6 +248,7 @@ 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,
@@ -258,7 +260,7 @@ 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);
@@ -270,8 +272,9 @@ 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));
@@ -302,8 +305,9 @@ 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);
        }
@@ -355,13 +359,15 @@ 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 e8b1e15312d8..176cdf411f9f 100644
--- a/drivers/gpu/drm/arm/display/komeda/komeda_pipeline_state.c
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_pipeline_state.c
@@ -1232,14 +1232,15 @@ 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);
@@ -1287,7 +1288,8 @@ 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); @@ -1297,10 +1299,10 @@ 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);
@@ -1331,16 +1333,17 @@ 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))


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