[tbb-commits] [tor-browser] 23/36: Bug 1786259 - Avoid potential deadlock via AddWithLegacyFamilyName when shared-fontlist is disabled (incl. safe mode). r=gfx-reviewers, aosmond a=RyanVM

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pierov pushed a commit to annotated tag FIREFOX_102_4_0esr_BUILD1
in repository tor-browser.

commit f0440910d05cbd5866553086efc1667af6ce4711
Author: Jonathan Kew <jkew at mozilla.com>
AuthorDate: Wed Sep 14 12:50:23 2022 +0000

    Bug 1786259 - Avoid potential deadlock via AddWithLegacyFamilyName when shared-fontlist is disabled (incl. safe mode). r=gfx-reviewers,aosmond a=RyanVM
    
    Differential Revision: https://phabricator.services.mozilla.com/D157311
---
 gfx/thebes/gfxFontEntry.cpp | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/gfx/thebes/gfxFontEntry.cpp b/gfx/thebes/gfxFontEntry.cpp
index bbd48c2a3696..26e7fca49bec 100644
--- a/gfx/thebes/gfxFontEntry.cpp
+++ b/gfx/thebes/gfxFontEntry.cpp
@@ -2040,8 +2040,16 @@ bool gfxFontFamily::CheckForLegacyFamilyNames(gfxPlatformFontList* aFontList) {
   mCheckedForLegacyFamilyNames = true;
   bool added = false;
   const uint32_t kNAME = TRUETYPE_TAG('n', 'a', 'm', 'e');
-  AutoReadLock lock(mLock);
-  for (const auto& fe : mAvailableFonts) {
+  AutoTArray<RefPtr<gfxFontEntry>, 16> faces;
+  {
+    // Take a local copy of the array of font entries, because it's possible
+    // AddWithLegacyFamilyName will mutate it (and it needs to be able to take
+    // an exclusive lock on the family to do so, so we release the read lock
+    // here).
+    AutoReadLock lock(mLock);
+    faces.AppendElements(mAvailableFonts);
+  }
+  for (const auto& fe : faces) {
     if (!fe) {
       continue;
     }

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