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avcodec/hevc_cabac: Check for ff_init_cabac_decoder() failure in cabac_reinit()

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Fixes: runtime error: left shift of negative value -967831544
Fixes: 2815/clusterfuzz-testcase-minimized-6062914471460864

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 2017-08-02 00:46:49 +02:00
parent d1bfa80ec4
commit 4ff94558f2
1 changed files with 12 additions and 10 deletions
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22
libavcodec/hevc_cabac.c
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@ -462,9 +462,9 @@ static void load_states(HEVCContext *s)
memcpy(s->HEVClc->cabac_state, s->cabac_state, HEVC_CONTEXTS);
}
static void cabac_reinit(HEVCLocalContext *lc)
static int cabac_reinit(HEVCLocalContext *lc)
{
skip_bytes(&lc->cc, 0);
return skip_bytes(&lc->cc, 0) == NULL ? AVERROR_INVALIDDATA : 0;
}
static int cabac_init_decoder(HEVCContext *s)
@ -524,25 +524,27 @@ int ff_hevc_cabac_init(HEVCContext *s, int ctb_addr_ts)
} else {
if (s->ps.pps->tiles_enabled_flag &&
s->ps.pps->tile_id[ctb_addr_ts] != s->ps.pps->tile_id[ctb_addr_ts - 1]) {
int ret;
if (s->threads_number == 1)
cabac_reinit(s->HEVClc);
ret = cabac_reinit(s->HEVClc);
else {
int ret = cabac_init_decoder(s);
if (ret < 0)
return ret;
ret = cabac_init_decoder(s);
}
if (ret < 0)
return ret;
cabac_init_state(s);
}
if (s->ps.pps->entropy_coding_sync_enabled_flag) {
if (ctb_addr_ts % s->ps.sps->ctb_width == 0) {
int ret;
get_cabac_terminate(&s->HEVClc->cc);
if (s->threads_number == 1)
cabac_reinit(s->HEVClc);
ret = cabac_reinit(s->HEVClc);
else {
int ret = cabac_init_decoder(s);
if (ret < 0)
return ret;
ret = cabac_init_decoder(s);
}
if (ret < 0)
return ret;
if (s->ps.sps->ctb_width == 1)
cabac_init_state(s);