diff options
| author | Cosmic Linden <cosmic@lindenlab.com> | 2022-07-22 13:45:00 -0700 |
|---|---|---|
| committer | Cosmic Linden <cosmic@lindenlab.com> | 2022-07-26 10:40:19 -0700 |
| commit | f1128da8da714b9d036fe1dbc66cf46ccf7747a5 (patch) | |
| tree | 2d5987293627ae44802796a06834b9d197e4aaba | |
| parent | bb318110efaa7161015be4228d985e49aefec8f8 (diff) | |
SL-17801: Use raw array for mOctreeTriangles to avoid memory alignment issues, increasing risk of crashes during picking due to SIMD operations
| -rw-r--r-- | indra/llmath/llvolume.cpp | 19 | ||||
| -rw-r--r-- | indra/llmath/llvolume.h | 3 |
2 files changed, 12 insertions, 10 deletions
diff --git a/indra/llmath/llvolume.cpp b/indra/llmath/llvolume.cpp index 55778fce3a..67c351ddd7 100644 --- a/indra/llmath/llvolume.cpp +++ b/indra/llmath/llvolume.cpp @@ -4707,6 +4707,7 @@ LLVolumeFace::LLVolumeFace() : #endif mWeightsScrubbed(FALSE), mOctree(NULL), + mOctreeTriangles(NULL), mOptimized(FALSE) { mExtents = (LLVector4a*) ll_aligned_malloc_16(sizeof(LLVector4a)*3); @@ -4736,8 +4737,9 @@ LLVolumeFace::LLVolumeFace(const LLVolumeFace& src) mJointIndices(NULL), #endif mWeightsScrubbed(FALSE), - mOctree(NULL) -{ + mOctree(NULL), + mOctreeTriangles(NULL) +{ mExtents = (LLVector4a*) ll_aligned_malloc_16(sizeof(LLVector4a)*3); mCenter = mExtents+2; *this = src; @@ -4879,8 +4881,8 @@ void LLVolumeFace::freeData() delete mOctree; mOctree = NULL; - mOctreeTriangles.clear(); - mOctreeTriangles.shrink_to_fit(); + delete[] mOctreeTriangles; + mOctreeTriangles = NULL; } BOOL LLVolumeFace::create(LLVolume* volume, BOOL partial_build) @@ -4890,8 +4892,8 @@ BOOL LLVolumeFace::create(LLVolume* volume, BOOL partial_build) //tree for this face is no longer valid delete mOctree; mOctree = NULL; - mOctreeTriangles.clear(); - mOctreeTriangles.shrink_to_fit(); + delete[] mOctreeTriangles; + mOctreeTriangles = NULL; LL_CHECK_MEMORY BOOL ret = FALSE ; @@ -5569,11 +5571,10 @@ void LLVolumeFace::createOctree(F32 scaler, const LLVector4a& center, const LLVe mOctree = new LLOctreeRoot<LLVolumeTriangle, LLVolumeTriangle*>(center, size, NULL); new LLVolumeOctreeListener(mOctree); - // Clear old triangles, but keep the underlying storage pointer - mOctreeTriangles.clear(); const U32 num_triangles = mNumIndices / 3; // Initialize all the triangles we need - mOctreeTriangles.resize(num_triangles); + delete[] mOctreeTriangles; // External code may delete mOctree + mOctreeTriangles = new LLVolumeTriangle[num_triangles]; for (U32 triangle_index = 0; triangle_index < num_triangles; ++triangle_index) { //for each triangle diff --git a/indra/llmath/llvolume.h b/indra/llmath/llvolume.h index da155c7b41..ffb02b934d 100644 --- a/indra/llmath/llvolume.h +++ b/indra/llmath/llvolume.h @@ -977,12 +977,13 @@ public: // This octree stores raw pointer references to triangles in mOctreeTriangles LLOctreeNode<LLVolumeTriangle, LLVolumeTriangle*>* mOctree; - std::vector<LLVolumeTriangle> mOctreeTriangles; //whether or not face has been cache optimized BOOL mOptimized; private: + LLVolumeTriangle* mOctreeTriangles; + BOOL createUnCutCubeCap(LLVolume* volume, BOOL partial_build = FALSE); BOOL createCap(LLVolume* volume, BOOL partial_build = FALSE); BOOL createSide(LLVolume* volume, BOOL partial_build = FALSE); |