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avcodec/vp7: Check for end of input in vp78_decode_mv_mb_modes() 

Fixes: Timeout
Fixes: 10313/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_VP7_fuzzer-5637719389110272

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Peter Ross <pross@xvid.org>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2018-12-15 01:53:16 +01:00
parent 3a95b73abc
commit b11b3d2585
1 changed files with 14 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
libavcodec/vp8.c
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@ -2268,7 +2268,7 @@ void filter_mb_simple(VP8Context *s, uint8_t *dst, VP8FilterStrength *f,
#define MARGIN (16 << 2)
static av_always_inline
void vp78_decode_mv_mb_modes(AVCodecContext *avctx, VP8Frame *curframe,
int vp78_decode_mv_mb_modes(AVCodecContext *avctx, VP8Frame *curframe,
VP8Frame *prev_frame, int is_vp7)
{
VP8Context *s = avctx->priv_data;
@ -2285,6 +2285,10 @@ void vp78_decode_mv_mb_modes(AVCodecContext *avctx, VP8Frame *curframe,
s->mv_bounds.mv_min.x = -MARGIN;
s->mv_bounds.mv_max.x = ((s->mb_width - 1) << 6) + MARGIN;
if (vpX_rac_is_end(&s->c)) {
return AVERROR_INVALIDDATA;
}
for (mb_x = 0; mb_x < s->mb_width; mb_x++, mb_xy++, mb++) {
if (mb_y == 0)
AV_WN32A((mb - s->mb_width - 1)->intra4x4_pred_mode_top,
@ -2298,18 +2302,19 @@ void vp78_decode_mv_mb_modes(AVCodecContext *avctx, VP8Frame *curframe,
s->mv_bounds.mv_min.y -= 64;
s->mv_bounds.mv_max.y -= 64;
}
return 0;
}
static void vp7_decode_mv_mb_modes(AVCodecContext *avctx, VP8Frame *cur_frame,
static int vp7_decode_mv_mb_modes(AVCodecContext *avctx, VP8Frame *cur_frame,
VP8Frame *prev_frame)
{
vp78_decode_mv_mb_modes(avctx, cur_frame, prev_frame, IS_VP7);
return vp78_decode_mv_mb_modes(avctx, cur_frame, prev_frame, IS_VP7);
}
static void vp8_decode_mv_mb_modes(AVCodecContext *avctx, VP8Frame *cur_frame,
static int vp8_decode_mv_mb_modes(AVCodecContext *avctx, VP8Frame *cur_frame,
VP8Frame *prev_frame)
{
vp78_decode_mv_mb_modes(avctx, cur_frame, prev_frame, IS_VP8);
return vp78_decode_mv_mb_modes(avctx, cur_frame, prev_frame, IS_VP8);
}
#if HAVE_THREADS
@ -2744,9 +2749,11 @@ int vp78_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
!s->segmentation.update_map)
ff_thread_await_progress(&prev_frame->tf, 1, 0);
if (is_vp7)
vp7_decode_mv_mb_modes(avctx, curframe, prev_frame);
ret = vp7_decode_mv_mb_modes(avctx, curframe, prev_frame);
else
vp8_decode_mv_mb_modes(avctx, curframe, prev_frame);
ret = vp8_decode_mv_mb_modes(avctx, curframe, prev_frame);
if (ret < 0)
goto err;
}
if (avctx->active_thread_type == FF_THREAD_FRAME)