G2M allows large images from small input and also reallocates
multiple buffers on any resolution change.
Fixes: Timeout (22sec -> 5sec)
Fixes: 18022/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_G2M_fuzzer-5089192530411520
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
case AV_CODEC_ID_MSRLE: maxpixels /= 16; break;
case AV_CODEC_ID_QTRLE: maxpixels /= 16; break;
case AV_CODEC_ID_SANM: maxpixels /= 16; break;
+ case AV_CODEC_ID_G2M: maxpixels /= 64; break;
case AV_CODEC_ID_GIF: maxpixels /= 16; break;
// Performs slow frame rescaling in C
case AV_CODEC_ID_GDV: maxpixels /= 512; break;