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Code Issues Releases Activity

avcodec/diracdec: Check for hpel_base allocation failure

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Fixes null pointer dereference
Fixes: signal_sigsegv_b02a96_280_RL_420p_ffdirac.drc with memlimit of 67108864

Found-by: Samuel Groß, Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2015-07-18 17:55:19 +02:00
parent a194298954
commit 1c5b712c0a
1 changed files with 12 additions and 4 deletions
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16
libavcodec/diracdec.c
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@ -1563,7 +1563,7 @@ static void select_dsp_funcs(DiracContext *s, int width, int height, int xblen,
}
}
static void interpolate_refplane(DiracContext *s, DiracFrame *ref, int plane, int width, int height)
static int interpolate_refplane(DiracContext *s, DiracFrame *ref, int plane, int width, int height)
{
/* chroma allocates an edge of 8 when subsampled
which for 4:2:2 means an h edge of 16 and v edge of 8
@ -1575,11 +1575,14 @@ static void interpolate_refplane(DiracContext *s, DiracFrame *ref, int plane, in
/* no need for hpel if we only have fpel vectors */
if (!s->mv_precision)
return;
return 0;
for (i = 1; i < 4; i++) {
if (!ref->hpel_base[plane][i])
ref->hpel_base[plane][i] = av_malloc((height+2*edge) * ref->avframe->linesize[plane] + 32);
if (!ref->hpel_base[plane][i]) {
return AVERROR(ENOMEM);
}
/* we need to be 16-byte aligned even for chroma */
ref->hpel[plane][i] = ref->hpel_base[plane][i] + edge*ref->avframe->linesize[plane] + 16;
}
@ -1593,6 +1596,8 @@ static void interpolate_refplane(DiracContext *s, DiracFrame *ref, int plane, in
s->mpvencdsp.draw_edges(ref->hpel[plane][3], ref->avframe->linesize[plane], width, height, edge, edge, EDGE_TOP | EDGE_BOTTOM);
}
ref->interpolated[plane] = 1;
return 0;
}
/**
@ -1646,8 +1651,11 @@ static int dirac_decode_frame_internal(DiracContext *s)
select_dsp_funcs(s, p->width, p->height, p->xblen, p->yblen);
for (i = 0; i < s->num_refs; i++)
interpolate_refplane(s, s->ref_pics[i], comp, p->width, p->height);
for (i = 0; i < s->num_refs; i++) {
int ret = interpolate_refplane(s, s->ref_pics[i], comp, p->width, p->height);
if (ret < 0)
return ret;
}
memset(s->mctmp, 0, 4*p->yoffset*p->stride);