avcodec/videotoolbox: fix kVTCouldNotFindVideoDecoderErr trying to decode HEVC on iOS

[ffmpeg] / libavcodec / hevc_sei.c

diff --git a/libavcodec/hevc_sei.c b/libavcodec/hevc_sei.c
index 8dd975508ac9f19559c7306a6432fe2025e4a5af..c59bd4321e2720beb62a880ca52a59d00ba9cef9 100644 (file)
--- a/libavcodec/hevc_sei.c
+++ b/libavcodec/hevc_sei.c
@@ -324,11 +324,15 @@ static int decode_nal_sei_message(GetBitContext *gb, void *logctx, HEVCSEI *s,
     av_log(logctx, AV_LOG_DEBUG, "Decoding SEI\n");
 
     while (byte == 0xFF) {
+        if (get_bits_left(gb) < 16 || payload_type > INT_MAX - 255)
+            return AVERROR_INVALIDDATA;
         byte          = get_bits(gb, 8);
         payload_type += byte;
     }
     byte = 0xFF;
     while (byte == 0xFF) {
+        if (get_bits_left(gb) < 8 + 8LL*payload_size)
+            return AVERROR_INVALIDDATA;
         byte          = get_bits(gb, 8);
         payload_size += byte;
     }