DivestOS/Patches/LineageOS-18.1/android_external_skia/408442.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Brian Osman <brianosman@google.com>
Date: Tue, 27 Aug 2024 14:22:52 -0400
Subject: [PATCH] RESTRICT AUTOMERGE: Avoid potential overflow when allocating
 3D mask from emboss filter

Note: the original fix landed after
Iac8b937e516dbfbbcefef54360dd5b7300bacb67 introduced SkMaskBuilder, so
this cherry-pick had to be tweaked to avoid conflicts. Unfortuantely
that means we need RESTRICT AUTOMERGE to prevent this modified version
from flowing through API boundaries into VIC, and we need to manually
cherry-pick it to each API level.

Bug: 344620577
Test: N/A -- unclear if even reachable
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/893738
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Ben Wagner <bungeman@google.com>
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:2bc38734eec777bf2574d4b38a7fd4fc05f0ecde)
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:69fc79acf3f05f269c55069ba5e2fbd00e1a76b6)
Merged-In: Ia35860371d45120baca63238e77faa5c0eb25d51
Change-Id: Ia35860371d45120baca63238e77faa5c0eb25d51
---
 src/effects/SkEmbossMaskFilter.cpp | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/src/effects/SkEmbossMaskFilter.cpp b/src/effects/SkEmbossMaskFilter.cpp
index 2dcce2b910..8ea8c08039 100644
--- a/src/effects/SkEmbossMaskFilter.cpp
+++ b/src/effects/SkEmbossMaskFilter.cpp
@@ -95,11 +95,13 @@ bool SkEmbossMaskFilter::filterMask(SkMask* dst, const SkMask& src,
 
     {
         uint8_t* alphaPlane = dst->fImage;
-        size_t   planeSize = dst->computeImageSize();
-        if (0 == planeSize) {
-            return false;   // too big to allocate, abort
+        size_t totalSize = dst->computeTotalImageSize();
+        if (totalSize == 0) {
+            return false;  // too big to allocate, abort
         }
-        dst->fImage = SkMask::AllocImage(planeSize * 3);
+        size_t planeSize = dst->computeImageSize();
+        SkASSERT(planeSize != 0);  // if totalSize didn't overflow, this can't either
+        dst->fImage = SkMask::AllocImage(totalSize);
         memcpy(dst->fImage, alphaPlane, planeSize);
         SkMask::FreeImage(alphaPlane);
     }