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avcodec/ffv1: seperate slice_count from max_slice_count 

Fix segfault with too large slice_count
Fixes Ticket4879

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2015-09-24 23:49:30 +02:00
parent 244184217c
commit aa6c43f3fd
4 changed files with 16 additions and 11 deletions
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14
libavcodec/ffv1.c
View File

@ -101,7 +101,7 @@ av_cold int ff_ffv1_init_slice_state(FFV1Context *f, FFV1Context *fs)
av_cold int ff_ffv1_init_slices_state(FFV1Context *f)
{
int i, ret;
for (i = 0; i < f->slice_count; i++) {
for (i = 0; i < f->max_slice_count; i++) {
FFV1Context *fs = f->slice_context[i];
if ((ret = ff_ffv1_init_slice_state(f, fs)) < 0)
return AVERROR(ENOMEM);
@ -113,10 +113,10 @@ av_cold int ff_ffv1_init_slice_contexts(FFV1Context *f)
{
int i;
f->slice_count = f->num_h_slices * f->num_v_slices;
av_assert0(f->slice_count > 0);
f->max_slice_count = f->num_h_slices * f->num_v_slices;
av_assert0(f->max_slice_count > 0);
for (i = 0; i < f->slice_count; i++) {
for (i = 0; i < f->max_slice_count; i++) {
int sx = i % f->num_h_slices;
int sy = i / f->num_h_slices;
int sxs = f->avctx->width * sx / f->num_h_slices;
@ -210,7 +210,7 @@ av_cold int ff_ffv1_close(AVCodecContext *avctx)
ff_thread_release_buffer(avctx, &s->last_picture);
av_frame_free(&s->last_picture.f);
for (j = 0; j < s->slice_count; j++) {
for (j = 0; j < s->max_slice_count; j++) {
FFV1Context *fs = s->slice_context[j];
for (i = 0; i < s->plane_count; i++) {
PlaneContext *p = &fs->plane[i];
@ -224,14 +224,14 @@ av_cold int ff_ffv1_close(AVCodecContext *avctx)
av_freep(&avctx->stats_out);
for (j = 0; j < s->quant_table_count; j++) {
av_freep(&s->initial_states[j]);
for (i = 0; i < s->slice_count; i++) {
for (i = 0; i < s->max_slice_count; i++) {
FFV1Context *sf = s->slice_context[i];
av_freep(&sf->rc_stat2[j]);
}
av_freep(&s->rc_stat2[j]);
}
for (i = 0; i < s->slice_count; i++)
for (i = 0; i < s->max_slice_count; i++)
av_freep(&s->slice_context[i]);
return 0;

1
libavcodec/ffv1.h
View File

@ -118,6 +118,7 @@ typedef struct FFV1Context {
struct FFV1Context *slice_context[MAX_SLICES];
int slice_count;
int max_slice_count;
int num_v_slices;
int num_h_slices;
int slice_width;

8
libavcodec/ffv1dec.c
View File

@ -775,6 +775,7 @@ static int read_header(FFV1Context *f)
av_log(f->avctx, AV_LOG_ERROR, "read_quant_table error\n");
return AVERROR_INVALIDDATA;
}
f->slice_count = f->max_slice_count;
} else if (f->version < 3) {
f->slice_count = get_symbol(c, state, 0);
} else {
@ -789,8 +790,8 @@ static int read_header(FFV1Context *f)
p -= size + trailer;
}
}
if (f->slice_count > (unsigned)MAX_SLICES || f->slice_count <= 0) {
av_log(f->avctx, AV_LOG_ERROR, "slice count %d is invalid\n", f->slice_count);
if (f->slice_count > (unsigned)MAX_SLICES || f->slice_count <= 0 || f->slice_count > f->max_slice_count) {
av_log(f->avctx, AV_LOG_ERROR, "slice count %d is invalid (max=%d)\n", f->slice_count, f->max_slice_count);
return AVERROR_INVALIDDATA;
}
@ -1016,6 +1017,7 @@ static int init_thread_copy(AVCodecContext *avctx)
f->picture.f = NULL;
f->last_picture.f = NULL;
f->sample_buffer = NULL;
f->max_slice_count = 0;
f->slice_count = 0;
for (i = 0; i < f->quant_table_count; i++) {
@ -1091,7 +1093,7 @@ static int update_thread_context(AVCodecContext *dst, const AVCodecContext *src)
av_assert0(!fdst->sample_buffer);
}
av_assert1(fdst->slice_count == fsrc->slice_count);
av_assert1(fdst->max_slice_count == fsrc->max_slice_count);
ff_thread_release_buffer(dst, &fdst->picture);

4
libavcodec/ffv1enc.c
View File

@ -982,6 +982,7 @@ slices_ok:
if ((ret = ff_ffv1_init_slice_contexts(s)) < 0)
return ret;
s->slice_count = s->max_slice_count;
if ((ret = ff_ffv1_init_slices_state(s)) < 0)
return ret;
@ -991,7 +992,7 @@ slices_ok:
if (!avctx->stats_out)
return AVERROR(ENOMEM);
for (i = 0; i < s->quant_table_count; i++)
for (j = 0; j < s->slice_count; j++) {
for (j = 0; j < s->max_slice_count; j++) {
FFV1Context *sf = s->slice_context[j];
av_assert0(!sf->rc_stat2[i]);
sf->rc_stat2[i] = av_mallocz(s->context_count[i] *
@ -1215,6 +1216,7 @@ static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
for (i = 0; i < f->quant_table_count; i++)
memset(f->rc_stat2[i], 0, f->context_count[i] * sizeof(*f->rc_stat2[i]));
av_assert0(f->slice_count == f->max_slice_count);
for (j = 0; j < f->slice_count; j++) {
FFV1Context *fs = f->slice_context[j];
for (i = 0; i < 256; i++) {