[Bf-blender-cvs] [e3f9d9b206e] master: Cleanup: quiet ASAN warnings for divide by zero & NULL memcpy args

[Campbell Barton]

Commit: e3f9d9b206e60f61c80abc6b162f60c6fdcfdc6e
Author: Campbell Barton
Date:   Thu Jan 20 11:29:32 2022 +1100
Branches: master
https://developer.blender.org/rBe3f9d9b206e60f61c80abc6b162f60c6fdcfdc6e

Cleanup: quiet ASAN warnings for divide by zero & NULL memcpy args

No functional changes as the inf value was never used &
memcpy args were only NULL when the size to copy was zero.

===================================================================

M	source/blender/blenkernel/intern/armature.c
M	source/blender/blenkernel/intern/mesh_merge.c

===================================================================

diff --git a/source/blender/blenkernel/intern/armature.c b/source/blender/blenkernel/intern/armature.c
index ff8c05110b8..5704ef6e42f 100644
--- a/source/blender/blenkernel/intern/armature.c
+++ b/source/blender/blenkernel/intern/armature.c
@@ -1356,9 +1356,12 @@ static void ease_handle_axis(const float deriv1[3], const float deriv2[3], float
 
   copy_v3_v3(r_axis, deriv1);
 
-  float len1 = len_squared_v3(deriv1), len2 = len_squared_v3(deriv2);
-  float ratio = len1 / len2;
-
+  const float len2 = len_squared_v3(deriv2);
+  if (UNLIKELY(len2 == 0.0f)) {
+    return;
+  }
+  const float len1 = len_squared_v3(deriv1);
+  const float ratio = len1 / len2;
   if (ratio < gap * gap) {
     madd_v3_v3fl(r_axis, deriv2, gap - sqrtf(ratio));
   }
diff --git a/source/blender/blenkernel/intern/mesh_merge.c b/source/blender/blenkernel/intern/mesh_merge.c
index 0115a70a52a..134a1344f83 100644
--- a/source/blender/blenkernel/intern/mesh_merge.c
+++ b/source/blender/blenkernel/intern/mesh_merge.c
@@ -615,10 +615,18 @@ Mesh *BKE_mesh_merge_verts(Mesh *mesh,
   }
 
   /* Copy over data. #CustomData_add_layer can do this, need to look it up. */
-  memcpy(result->mvert, mvert, sizeof(MVert) * STACK_SIZE(mvert));
-  memcpy(result->medge, medge, sizeof(MEdge) * STACK_SIZE(medge));
-  memcpy(result->mloop, mloop, sizeof(MLoop) * STACK_SIZE(mloop));
-  memcpy(result->mpoly, mpoly, sizeof(MPoly) * STACK_SIZE(mpoly));
+  if (STACK_SIZE(mvert)) {
+    memcpy(result->mvert, mvert, sizeof(MVert) * STACK_SIZE(mvert));
+  }
+  if (STACK_SIZE(medge)) {
+    memcpy(result->medge, medge, sizeof(MEdge) * STACK_SIZE(medge));
+  }
+  if (STACK_SIZE(mloop)) {
+    memcpy(result->mloop, mloop, sizeof(MLoop) * STACK_SIZE(mloop));
+  }
+  if (STACK_SIZE(mpoly)) {
+    memcpy(result->mpoly, mpoly, sizeof(MPoly) * STACK_SIZE(mpoly));
+  }
 
   MEM_freeN(mvert);
   MEM_freeN(medge);