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avcodec/mscc: move frame allocates to later 

Fixes: Timeout
Fixes: 66964/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SRGC_fuzzer-5413170363564032
Fixes: 69373/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MSCC_fuzzer-5239787748392960

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2024-03-20 23:48:24 +01:00
parent b248dace92
commit 664fbfb9ac
No known key found for this signature in database
GPG Key ID: B18E8928B3948D64
1 changed files with 21 additions and 22 deletions
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43
libavcodec/mscc.c
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@ -149,28 +149,6 @@ static int decode_frame(AVCodecContext *avctx, AVFrame *frame,
if (avpkt->size < 3)
return buf_size;
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
return ret;
if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
size_t size;
const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, &size);
if (pal && size == AVPALETTE_SIZE) {
#if FF_API_PALETTE_HAS_CHANGED
FF_DISABLE_DEPRECATION_WARNINGS
frame->palette_has_changed = 1;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
for (j = 0; j < 256; j++)
s->pal[j] = 0xFF000000 | AV_RL32(pal + j * 4);
} else if (pal) {
av_log(avctx, AV_LOG_ERROR,
"Palette size %"SIZE_SPECIFIER" is wrong\n", size);
}
memcpy(frame->data[1], s->pal, AVPALETTE_SIZE);
}
ret = inflateReset(zstream);
if (ret != Z_OK) {
av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", ret);
@ -198,6 +176,27 @@ inflate_error:
av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", ret);
return AVERROR_UNKNOWN;
}
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
return ret;
if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
size_t size;
const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, &size);
if (pal && size == AVPALETTE_SIZE) {
#if FF_API_PALETTE_HAS_CHANGED
FF_DISABLE_DEPRECATION_WARNINGS
frame->palette_has_changed = 1;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
for (j = 0; j < 256; j++)
s->pal[j] = 0xFF000000 | AV_RL32(pal + j * 4);
} else if (pal) {
av_log(avctx, AV_LOG_ERROR,
"Palette size %"SIZE_SPECIFIER" is wrong\n", size);
}
memcpy(frame->data[1], s->pal, AVPALETTE_SIZE);
}
bytestream2_init(&gb, s->decomp_buf, zstream->total_out);
bytestream2_init_writer(&pb, s->uncomp_buf, s->uncomp_size);