avcodec/speedhq: Width < 8 is not supported

Fixes: out of array access
Fixes: 31733/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SPEEDHQ_fuzzer-4704307963363328
Fixes: 31736/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SPEEDHQ_fuzzer-6190960292790272
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

diff --git a/libavcodec/speedhq.c b/libavcodec/speedhq.c
index 5861b7f6b515e84887e301bf262c8487ca5fe3db..711bcd66d7d299053c017036956b29e997f6158e 100644 (file)
--- a/libavcodec/speedhq.c
+++ b/libavcodec/speedhq.c
@@ -498,7 +498,7 @@ static int speedhq_decode_frame(AVCodecContext *avctx,
     uint32_t second_field_offset;
     int ret;
 
-    if (buf_size < 4)
+    if (buf_size < 4 || avctx->width < 8)
         return AVERROR_INVALIDDATA;
 
     quality = buf[0];