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avcodec/svq3: Use ff_set_dimension() 

Fixes: OOM
Fixes: 15410/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SVQ3_fuzzer-5659464805384192

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 2019-06-25 23:42:43 +02:00
parent f76d7352e0
commit 7b114d7687
1 changed files with 20 additions and 16 deletions
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36
libavcodec/svq3.c
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@ -1183,6 +1183,7 @@ static av_cold int svq3_decode_init(AVCodecContext *avctx)
GetBitContext gb; GetBitContext gb;
int frame_size_code; int frame_size_code;
int unk0, unk1, unk2, unk3, unk4; int unk0, unk1, unk2, unk3, unk4;
int w,h;
size = AV_RB32(&extradata[4]); size = AV_RB32(&extradata[4]);
if (size > extradata_end - extradata - 8) { if (size > extradata_end - extradata - 8) {
@ -1195,38 +1196,41 @@ static av_cold int svq3_decode_init(AVCodecContext *avctx)
frame_size_code = get_bits(&gb, 3); frame_size_code = get_bits(&gb, 3);
switch (frame_size_code) { switch (frame_size_code) {
case 0: case 0:
avctx->width = 160; w = 160;
avctx->height = 120; h = 120;
break; break;
case 1: case 1:
avctx->width = 128; w = 128;
avctx->height = 96; h = 96;
break; break;
case 2: case 2:
avctx->width = 176; w = 176;
avctx->height = 144; h = 144;
break; break;
case 3: case 3:
avctx->width = 352; w = 352;
avctx->height = 288; h = 288;
break; break;
case 4: case 4:
avctx->width = 704; w = 704;
avctx->height = 576; h = 576;
break; break;
case 5: case 5:
avctx->width = 240; w = 240;
avctx->height = 180; h = 180;
break; break;
case 6: case 6:
avctx->width = 320; w = 320;
avctx->height = 240; h = 240;
break; break;
case 7: case 7:
avctx->width = get_bits(&gb, 12); w = get_bits(&gb, 12);
avctx->height = get_bits(&gb, 12); h = get_bits(&gb, 12);
break; break;
} }
ret = ff_set_dimensions(avctx, w, h);
if (ret < 0)
goto fail;
s->halfpel_flag = get_bits1(&gb); s->halfpel_flag = get_bits1(&gb);
s->thirdpel_flag = get_bits1(&gb); s->thirdpel_flag = get_bits1(&gb);