diff options
| author | Grazvydas Ignotas <notasas@gmail.com> | 2016-09-25 23:34:46 +0300 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2016-09-27 13:00:51 -0400 |
| commit | 54ddf3a6af537cbfe038f9a2754f26de80c5818b (patch) | |
| tree | 69c4821436f125ff09faff6f71873c913c3d33ba | |
| parent | d8907643cc6b00e96aeb1555f0e0c2930f69c18b (diff) | |
| download | linux-54ddf3a6af537cbfe038f9a2754f26de80c5818b.tar.bz2 | |
drm/amdgpu: don't leave dangling pointers around
Right now it's possible to trigger fence_drv.fences[] dereference after
the array has been freed. While the real problem is elsewhere, this still
results in confusing errors that depend on how the freed memory was
reused (I've seen "kernel tried to execute NX-protected page"), it's
better to clear them and get NULL dereference so that it's obvious what's
going wrong.
Signed-off-by: Grazvydas Ignotas <notasas@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
| -rw-r--r-- | drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c | 2 | ||||
| -rw-r--r-- | drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c | 1 |
2 files changed, 3 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c index 17e13621fae9..e203e5561107 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c @@ -60,6 +60,7 @@ static int amdgpu_ctx_init(struct amdgpu_device *adev, struct amdgpu_ctx *ctx) amd_sched_entity_fini(&adev->rings[j]->sched, &ctx->rings[j].entity); kfree(ctx->fences); + ctx->fences = NULL; return r; } return 0; @@ -77,6 +78,7 @@ static void amdgpu_ctx_fini(struct amdgpu_ctx *ctx) for (j = 0; j < amdgpu_sched_jobs; ++j) fence_put(ctx->rings[i].fences[j]); kfree(ctx->fences); + ctx->fences = NULL; for (i = 0; i < adev->num_rings; i++) amd_sched_entity_fini(&adev->rings[i]->sched, diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c index 0b109aebfec6..3a2e42f4b897 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c @@ -454,6 +454,7 @@ void amdgpu_fence_driver_fini(struct amdgpu_device *adev) for (j = 0; j <= ring->fence_drv.num_fences_mask; ++j) fence_put(ring->fence_drv.fences[j]); kfree(ring->fence_drv.fences); + ring->fence_drv.fences = NULL; ring->fence_drv.initialized = false; } } |