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Fix #119026: GPv3: Stack use after scope #119054

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YimingWu merged 2 commits from ChengduLittleA/blender:fix-119026 into main 2024-03-04 15:30:18 +01:00
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YimingWu commented 2024-03-04 15:11:30 +01:00
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The arrays modified_starts and modified_ends was freed early
due to wrong variable scope, this leads to incorrect randomize length
effect in length modifier. Now fixed.

The arrays `modified_starts` and `modified_ends` was freed early due to wrong variable scope, this leads to incorrect randomize length effect in length modifier. Now fixed.
YimingWu added 1 commit 2024-03-04 15:11:34 +01:00
YimingWu requested review from Falk David 2024-03-04 15:11:46 +01:00
YimingWu added the
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Hans Goudey requested changes 2024-03-04 15:19:32 +01:00
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source/blender/modifiers/intern/MOD_grease_pencil_length.cc Outdated
@ -128,11 +128,11 @@ static void deform_drawing(const ModifierData &md,
VArray<float> use_starts = VArray<float>::ForSingle(mmd.start_fac, curves_num);
VArray<float> use_ends = VArray<float>::ForSingle(mmd.end_fac, curves_num);
Array<float> modified_starts(curves.curves_num(), mmd.start_fac);
Hans Goudey commented 2024-03-04 15:19:30 +01:00
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Just declare them with the default constructor here and construct them with the necessary size and value inside the if statement.

Just declare them with the default constructor here and construct them with the necessary size and value inside the if statement.
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Falk David commented 2024-03-04 15:23:35 +01:00
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I think this is a bit better. Means that you can leave the Arrays inside the if scope.

diff --git a/source/blender/modifiers/intern/MOD_grease_pencil_length.cc b/source/blender/modifiers/intern/MOD_grease_pencil_length.cc
index c41190a2d9e..86148cb9ede 100644
--- a/source/blender/modifiers/intern/MOD_grease_pencil_length.cc
+++ b/source/blender/modifiers/intern/MOD_grease_pencil_length.cc
@@ -133,8 +133,6 @@ static void deform_drawing(const ModifierData &md,
      * branch so it could be accessed in later stretching/shrinking stages. */
     Array<float> modified_starts(curves.curves_num(), mmd.start_fac);
     Array<float> modified_ends(curves.curves_num(), mmd.end_fac);
-    use_starts = VArray<float>::ForSpan(modified_starts.as_mutable_span());
-    use_ends = VArray<float>::ForSpan(modified_ends.as_mutable_span());
 
     int seed = mmd.seed;
 
@@ -176,6 +174,9 @@ static void deform_drawing(const ModifierData &md,
         }
       }
     });
+
+    use_starts = VArray<float>::ForContainer(modified_starts);
+    use_ends = VArray<float>::ForContainer(modified_ends);
   }
 
   curves = geometry::extend_curves(curves,
I think this is a bit better. Means that you can leave the `Array`s inside the if scope. ```diff diff --git a/source/blender/modifiers/intern/MOD_grease_pencil_length.cc b/source/blender/modifiers/intern/MOD_grease_pencil_length.cc index c41190a2d9e..86148cb9ede 100644 --- a/source/blender/modifiers/intern/MOD_grease_pencil_length.cc +++ b/source/blender/modifiers/intern/MOD_grease_pencil_length.cc @@ -133,8 +133,6 @@ static void deform_drawing(const ModifierData &md, * branch so it could be accessed in later stretching/shrinking stages. */ Array<float> modified_starts(curves.curves_num(), mmd.start_fac); Array<float> modified_ends(curves.curves_num(), mmd.end_fac); - use_starts = VArray<float>::ForSpan(modified_starts.as_mutable_span()); - use_ends = VArray<float>::ForSpan(modified_ends.as_mutable_span()); int seed = mmd.seed; @@ -176,6 +174,9 @@ static void deform_drawing(const ModifierData &md, } } }); + + use_starts = VArray<float>::ForContainer(modified_starts); + use_ends = VArray<float>::ForContainer(modified_ends); } curves = geometry::extend_curves(curves, ```
YimingWu added 1 commit 2024-03-04 15:24:55 +01:00
Falk David approved these changes 2024-03-04 15:27:24 +01:00
Falk David left a comment
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I suppose this works as well. I'm fine with either.

I suppose this works as well. I'm fine with either.
Hans Goudey approved these changes 2024-03-04 15:28:52 +01:00
Hans Goudey changed title from Fix #119026: GPv3: Fix variable scope to Fix #119026: GPv3: Stack use after scope 2024-03-04 15:29:09 +01:00
YimingWu merged commit 4f70190a01 into main 2024-03-04 15:30:18 +01:00
YimingWu deleted branch fix-119026 2024-03-04 15:30:20 +01:00
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