commit 71062bd103ff460ef7708fe465aa1be38bf3e3ff Author: Chun-Min Chang chun.m.chang@gmail.com Date: Tue Jul 21 23:39:14 2020 +0000

Bug 1650281 - P2: Make sure `gCombinedSizes` won't be underflowed r=gerald

In any case, `gCombinedSizes` should be larger than or equal to the buffer within `MemoryClockCache`.

Differential Revision: https://phabricator.services.mozilla.com/D84274 --- dom/media/MemoryBlockCache.cpp | 1 + 1 file changed, 1 insertion(+)

diff --git a/dom/media/MemoryBlockCache.cpp b/dom/media/MemoryBlockCache.cpp index bf073e6769d0..2848a3f3812c 100644 --- a/dom/media/MemoryBlockCache.cpp +++ b/dom/media/MemoryBlockCache.cpp @@ -52,6 +52,7 @@ MemoryBlockCache::MemoryBlockCache(int64_t aContentLength) }

MemoryBlockCache::~MemoryBlockCache() { + MOZ_ASSERT(gCombinedSizes >= mBuffer.Length()); size_t sizes = static_cast<size_t>(gCombinedSizes -= mBuffer.Length()); LOG("~MemoryBlockCache() - destroying buffer of size %zu; combined sizes now " "%zu",