commit 2deb1e079130327fb7d6d9beb367651ca939775c Author: Chun-Min Chang chun.m.chang@gmail.com Date: Tue Jul 21 23:38:57 2020 +0000

Bug 1650281 - P1: Widen `gCombinedSizes` once the buffers grow r=gerald

The `gCombinedSizes` need to be enlarged once the inner buffer within `MemoryBlockCache` grows. Otherwise, when the `MemoryBlockCache` is released, subtracting the buffer-size of the `MemoryBlockCache` from `gCombinedSizes` lead to a underflow.

Differential Revision: https://phabricator.services.mozilla.com/D84273 --- dom/media/MemoryBlockCache.cpp | 4 ++++ 1 file changed, 4 insertions(+)

diff --git a/dom/media/MemoryBlockCache.cpp b/dom/media/MemoryBlockCache.cpp index 2d31119dca0a..bf073e6769d0 100644 --- a/dom/media/MemoryBlockCache.cpp +++ b/dom/media/MemoryBlockCache.cpp @@ -114,6 +114,10 @@ bool MemoryBlockCache::EnsureBufferCanContain(size_t aContentLength) { // possibly bypass some future growths that would fit in this new capacity. mBuffer.SetLength(capacity); } + const size_t newSizes = gCombinedSizes += (extra + extraCapacity); + LOG("EnsureBufferCanContain(%zu) - buffer size %zu + requested %zu + bonus " + "%zu = %zu; combined sizes %zu", + aContentLength, initialLength, extra, extraCapacity, capacity, newSizes); mHasGrown = true; return true; }