[FFmpeg-devel] [PATCH 2/2] avcodec/mjpegdec: Check for odd progressive RGB

[Michael Niedermayer]

Fixes: out of array access
Fixes: 9225/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_JPEGLS_fuzzer-5684770334834688

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
---
 libavcodec/mjpegdec.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libavcodec/mjpegdec.c b/libavcodec/mjpegdec.c
index 00cfdd7151..5e784d980c 100644
--- a/libavcodec/mjpegdec.c
+++ b/libavcodec/mjpegdec.c
@@ -626,6 +626,10 @@ unk_pixfmt:
         avpriv_report_missing_feature(s->avctx, "Lowres for weird subsampling");
         return AVERROR_PATCHWELCOME;
     }
+    if ((AV_RB32(s->upscale_h) || AV_RB32(s->upscale_v)) && s->progressive && s->avctx->pix_fmt == AV_PIX_FMT_GBRP) {
+        avpriv_report_missing_feature(s->avctx, "progressive for weird subsampling");
+        return AVERROR_PATCHWELCOME;
+    }
     if (s->ls) {
         memset(s->upscale_h, 0, sizeof(s->upscale_h));
         memset(s->upscale_v, 0, sizeof(s->upscale_v));
-- 
2.18.0