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avcodec/hnm4video: Forward errors of decode_interframe_v4() 

Fixes: Timeout (108sec -> 160ms)
Fixes: 15570/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_HNM4_VIDEO_fuzzer-5085482213441536

Reviewed-by: Tomas Härdin <tjoppen@acc.umu.se>
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 2019-08-02 23:54:49 +02:00
parent a3adc3b6a0
commit 9af8ce754b
1 changed files with 14 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
libavcodec/hnm4video.c
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@ -143,7 +143,7 @@ static void copy_processed_frame(AVCodecContext *avctx, AVFrame *frame)
}
}
static void decode_interframe_v4(AVCodecContext *avctx, uint8_t *src, uint32_t size)
static int decode_interframe_v4(AVCodecContext *avctx, uint8_t *src, uint32_t size)
{
Hnm4VideoContext *hnm = avctx->priv_data;
GetByteContext gb;
@ -162,7 +162,7 @@ static void decode_interframe_v4(AVCodecContext *avctx, uint8_t *src, uint32_t s
if (tag == 0) {
if (writeoffset + 2 > hnm->width * hnm->height) {
av_log(avctx, AV_LOG_ERROR, "writeoffset out of bounds\n");
break;
return AVERROR_INVALIDDATA;
}
hnm->current[writeoffset++] = bytestream2_get_byte(&gb);
hnm->current[writeoffset++] = bytestream2_get_byte(&gb);
@ -176,7 +176,7 @@ static void decode_interframe_v4(AVCodecContext *avctx, uint8_t *src, uint32_t s
count = bytestream2_get_byte(&gb) * 2;
if (writeoffset + count > hnm->width * hnm->height) {
av_log(avctx, AV_LOG_ERROR, "writeoffset out of bounds\n");
break;
return AVERROR_INVALIDDATA;
}
while (count > 0) {
hnm->current[writeoffset++] = bytestream2_peek_byte(&gb);
@ -188,7 +188,7 @@ static void decode_interframe_v4(AVCodecContext *avctx, uint8_t *src, uint32_t s
}
if (writeoffset > hnm->width * hnm->height) {
av_log(avctx, AV_LOG_ERROR, "writeoffset out of bounds\n");
break;
return AVERROR_INVALIDDATA;
}
} else {
previous = bytestream2_peek_byte(&gb) & 0x20;
@ -204,24 +204,25 @@ static void decode_interframe_v4(AVCodecContext *avctx, uint8_t *src, uint32_t s
if (!backward && offset + 2*count > hnm->width * hnm->height) {
av_log(avctx, AV_LOG_ERROR, "Attempting to read out of bounds\n");
break;
return AVERROR_INVALIDDATA;
} else if (backward && offset + 1 >= hnm->width * hnm->height) {
av_log(avctx, AV_LOG_ERROR, "Attempting to read out of bounds\n");
break;
return AVERROR_INVALIDDATA;
} else if (writeoffset + 2*count > hnm->width * hnm->height) {
av_log(avctx, AV_LOG_ERROR,
"Attempting to write out of bounds\n");
break;
return AVERROR_INVALIDDATA;
}
if(backward) {
if (offset < (!!backline)*(2 * hnm->width - 1) + 2*(left-1)) {
av_log(avctx, AV_LOG_ERROR, "Attempting to read out of bounds\n");
break;
return AVERROR_INVALIDDATA;
}
} else {
if (offset < (!!backline)*(2 * hnm->width - 1)) {
av_log(avctx, AV_LOG_ERROR, "Attempting to read out of bounds\n");
break;
return AVERROR_INVALIDDATA;
}
}
@ -268,6 +269,7 @@ static void decode_interframe_v4(AVCodecContext *avctx, uint8_t *src, uint32_t s
}
}
}
return 0;
}
static void decode_interframe_v4a(AVCodecContext *avctx, uint8_t *src,
@ -435,7 +437,9 @@ static int hnm_decode_frame(AVCodecContext *avctx, void *data,
decode_interframe_v4a(avctx, avpkt->data + 8, avpkt->size - 8);
memcpy(hnm->processed, hnm->current, hnm->width * hnm->height);
} else {
decode_interframe_v4(avctx, avpkt->data + 8, avpkt->size - 8);
int ret = decode_interframe_v4(avctx, avpkt->data + 8, avpkt->size - 8);
if (ret < 0)
return ret;
postprocess_current_frame(avctx);
}
copy_processed_frame(avctx, frame);