[FFmpeg-devel] [PATCH] avcodec/pngdec: fix possible race condition with APNG decoding
Paul B Mahol
onemda at gmail.com
Thu Feb 11 23:58:33 EET 2021
Fixes #9017
Signed-off-by: Paul B Mahol <onemda at gmail.com>
---
libavcodec/pngdec.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/libavcodec/pngdec.c b/libavcodec/pngdec.c
index 395b86bbe7..61642b7cbe 100644
--- a/libavcodec/pngdec.c
+++ b/libavcodec/pngdec.c
@@ -711,13 +711,13 @@ static int decode_idat_chunk(AVCodecContext *avctx, PNGDecContext *s,
s->bpp += byte_depth;
}
- if ((ret = ff_thread_get_buffer(avctx, &s->picture, AV_GET_BUFFER_FLAG_REF)) < 0)
- return ret;
if (avctx->codec_id == AV_CODEC_ID_APNG && s->last_dispose_op != APNG_DISPOSE_OP_PREVIOUS) {
ff_thread_release_buffer(avctx, &s->previous_picture);
if ((ret = ff_thread_get_buffer(avctx, &s->previous_picture, AV_GET_BUFFER_FLAG_REF)) < 0)
return ret;
}
+ if ((ret = ff_thread_get_buffer(avctx, &s->picture, AV_GET_BUFFER_FLAG_REF)) < 0)
+ return ret;
p->pict_type = AV_PICTURE_TYPE_I;
p->key_frame = 1;
p->interlaced_frame = !!s->interlace_type;
--
2.17.1
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