Add checks for incorrect sticker cache bytes.

2019-07-10 12:52:36 +02:00 · 2019-07-10 12:52:36 +02:00 · c3c6571835
parent b9d3ba621e
commit c3c6571835
1 changed files with 3 additions and 0 deletions
--- a/Telegram/SourceFiles/lottie/lottie_cache.cpp
+++ b/Telegram/SourceFiles/lottie/lottie_cache.cpp
@ -594,6 +594,9 @@ void Cache::prepareBuffers() {
 }

 Cache::ReadResult Cache::readCompressedFrame() {
+	if (_data.size() < _offset) {
+		return { false };
+	}
 	auto length = qint32(0);
 	const auto part = bytes::make_span(_data).subspan(_offset);
 	if (part.size() < sizeof(length)) {