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avcodec/mpeg4video: Check time_incr 

Fixes assertion failure
Fixes out of memory access

Fixes: test_casex.ivf

Found-by: Tyson Smith <twsmith@mozilla.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 7c97946d61)

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2016-01-12 03:03:01 +01:00
parent 250e5cb71d
commit 78f9c7dd14
3 changed files with 15 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
libavcodec/mpeg4video.h
View File

@ -137,7 +137,7 @@ void ff_mpeg4_encode_mb(MpegEncContext *s,
void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n,
int dir);
void ff_set_mpeg4_time(MpegEncContext *s);
void ff_mpeg4_encode_picture_header(MpegEncContext *s, int picture_number);
int ff_mpeg4_encode_picture_header(MpegEncContext *s, int picture_number);
int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb);
void ff_mpeg4_encode_video_packet_header(MpegEncContext *s);

10
libavcodec/mpeg4videoenc.c
View File

@ -1086,7 +1086,7 @@ static void mpeg4_encode_vol_header(MpegEncContext *s,
}
/* write mpeg4 VOP header */
void ff_mpeg4_encode_picture_header(MpegEncContext *s, int picture_number)
int ff_mpeg4_encode_picture_header(MpegEncContext *s, int picture_number)
{
int time_incr;
int time_div, time_mod;
@ -1112,6 +1112,12 @@ void ff_mpeg4_encode_picture_header(MpegEncContext *s, int picture_number)
time_mod = FFUMOD(s->time, s->avctx->time_base.den);
time_incr = time_div - s->last_time_base;
av_assert0(time_incr >= 0);
// This limits the frame duration to max 1 hour
if (time_incr > 3600) {
av_log(s->avctx, AV_LOG_ERROR, "time_incr %d too large\n", time_incr);
return AVERROR(EINVAL);
}
while (time_incr--)
put_bits(&s->pb, 1, 1);
@ -1137,6 +1143,8 @@ void ff_mpeg4_encode_picture_header(MpegEncContext *s, int picture_number)
put_bits(&s->pb, 3, s->f_code); /* fcode_for */
if (s->pict_type == AV_PICTURE_TYPE_B)
put_bits(&s->pb, 3, s->b_code); /* fcode_back */
return 0;
}
static av_cold void init_uni_dc_tab(void)

8
libavcodec/mpegvideo_enc.c
View File

@ -3656,9 +3656,11 @@ static int encode_picture(MpegEncContext *s, int picture_number)
ff_wmv2_encode_picture_header(s, picture_number);
else if (CONFIG_MSMPEG4_ENCODER && s->msmpeg4_version)
ff_msmpeg4_encode_picture_header(s, picture_number);
else if (CONFIG_MPEG4_ENCODER && s->h263_pred)
ff_mpeg4_encode_picture_header(s, picture_number);
else if (CONFIG_RV10_ENCODER && s->codec_id == AV_CODEC_ID_RV10) {
else if (CONFIG_MPEG4_ENCODER && s->h263_pred) {
ret = ff_mpeg4_encode_picture_header(s, picture_number);
if (ret < 0)
return ret;
} else if (CONFIG_RV10_ENCODER && s->codec_id == AV_CODEC_ID_RV10) {
ret = ff_rv10_encode_picture_header(s, picture_number);
if (ret < 0)
return ret;