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mpegvideo: allocate scratch buffers after linesize is known 

Since we can't know which stride a custom get_buffer() implementation is
going to use we have to allocate this scratch buffers after the linesize
is known. It was pretty safe for 8 bit per pixel pixel formats since we
always allocated memory for up to 16 bits per pixel. It broke hoever
with cmdutis.c's alloc_buffer() and high pixel bit depth since it
allocated larger edges than mpegvideo expected.

Fixes fuzzed sample nasa-8s2.ts_s244342.
This commit is contained in:
Janne Grunau 2012-11-25 22:42:07 +01:00
parent ed2d7d5868
commit f1d8763a02
5 changed files with 85 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
libavcodec/h264.c
View File

@ -2292,8 +2292,10 @@ static int field_end(H264Context *h, int in_setup)
/**
* Replicate H264 "master" context to thread contexts.
*/
static void clone_slice(H264Context *dst, H264Context *src)
static int clone_slice(H264Context *dst, H264Context *src)
{
int ret;
memcpy(dst->block_offset, src->block_offset, sizeof(dst->block_offset));
dst->s.current_picture_ptr = src->s.current_picture_ptr;
dst->s.current_picture = src->s.current_picture;
@ -2301,6 +2303,13 @@ static void clone_slice(H264Context *dst, H264Context *src)
dst->s.uvlinesize = src->s.uvlinesize;
dst->s.first_field = src->s.first_field;
if (!dst->s.edge_emu_buffer &&
(ret = ff_mpv_frame_size_alloc(&dst->s, dst->s.linesize))) {
av_log(dst->s.avctx, AV_LOG_ERROR,
"Failed to allocate scratch buffers\n");
return ret;
}
dst->prev_poc_msb = src->prev_poc_msb;
dst->prev_poc_lsb = src->prev_poc_lsb;
dst->prev_frame_num_offset = src->prev_frame_num_offset;
@ -2314,6 +2323,8 @@ static void clone_slice(H264Context *dst, H264Context *src)
memcpy(dst->dequant4_coeff, src->dequant4_coeff, sizeof(src->dequant4_coeff));
memcpy(dst->dequant8_coeff, src->dequant8_coeff, sizeof(src->dequant8_coeff));
return 0;
}
/**
@ -2847,8 +2858,8 @@ static int decode_slice_header(H264Context *h, H264Context *h0)
ff_release_unused_pictures(s, 0);
}
}
if (h != h0)
clone_slice(h, h0);
if (h != h0 && (ret = clone_slice(h, h0)) < 0)
return ret;
s->current_picture_ptr->frame_num = h->frame_num; // FIXME frame_num cleanup

5
libavcodec/mpeg12.c
View File

@ -2394,7 +2394,10 @@ static int decode_chunks(AVCodecContext *avctx,
thread_context->end_mb_y = s2->mb_height;
if (s->slice_count) {
s2->thread_context[s->slice_count-1]->end_mb_y = mb_y;
ff_update_duplicate_context(thread_context, s2);
ret = ff_update_duplicate_context(thread_context,
s2);
if (ret < 0)
return ret;
}
init_get_bits(&thread_context->gb, buf_ptr, input_size*8);
s->slice_count++;

76
libavcodec/mpegvideo.c
View File

@ -235,12 +235,35 @@ static void free_frame_buffer(MpegEncContext *s, Picture *pic)
av_freep(&pic->f.hwaccel_picture_private);
}
int ff_mpv_frame_size_alloc(MpegEncContext *s, int linesize)
{
int alloc_size = FFALIGN(FFABS(linesize) + 32, 32);
// edge emu needs blocksize + filter length - 1
// (= 17x17 for halfpel / 21x21 for h264)
// linesize * interlaced * MBsize
FF_ALLOCZ_OR_GOTO(s->avctx, s->edge_emu_buffer, alloc_size * 2 * 21,
fail);
FF_ALLOCZ_OR_GOTO(s->avctx, s->me.scratchpad, alloc_size * 2 * 16 * 2,
fail)
s->me.temp = s->me.scratchpad;
s->rd_scratchpad = s->me.scratchpad;
s->b_scratchpad = s->me.scratchpad;
s->obmc_scratchpad = s->me.scratchpad + 16;
return 0;
fail:
av_freep(&s->edge_emu_buffer);
return AVERROR(ENOMEM);
}
/**
* Allocate a frame buffer
*/
static int alloc_frame_buffer(MpegEncContext *s, Picture *pic)
{
int r;
int r, ret;
if (s->avctx->hwaccel) {
assert(!pic->f.hwaccel_picture_private);
@ -282,6 +305,14 @@ static int alloc_frame_buffer(MpegEncContext *s, Picture *pic)
return -1;
}
if (!s->edge_emu_buffer &&
(ret = ff_mpv_frame_size_alloc(s, pic->f.linesize[0])) < 0) {
av_log(s->avctx, AV_LOG_ERROR,
"get_buffer() failed to allocate context scratch buffers.\n");
free_frame_buffer(s, pic);
return ret;
}
return 0;
}
@ -419,19 +450,13 @@ static int init_duplicate_context(MpegEncContext *s, MpegEncContext *base)
int yc_size = y_size + 2 * c_size;
int i;
// edge emu needs blocksize + filter length - 1
// (= 17x17 for halfpel / 21x21 for h264)
FF_ALLOCZ_OR_GOTO(s->avctx, s->edge_emu_buffer,
(s->width + 64) * 2 * 21 * 2, fail); // (width + edge + align)*interlaced*MBsize*tolerance
s->edge_emu_buffer =
s->me.scratchpad =
s->me.temp =
s->rd_scratchpad =
s->b_scratchpad =
s->obmc_scratchpad = NULL;
// FIXME should be linesize instead of s->width * 2
// but that is not known before get_buffer()
FF_ALLOCZ_OR_GOTO(s->avctx, s->me.scratchpad,
(s->width + 64) * 4 * 16 * 2 * sizeof(uint8_t), fail)
s->me.temp = s->me.scratchpad;
s->rd_scratchpad = s->me.scratchpad;
s->b_scratchpad = s->me.scratchpad;
s->obmc_scratchpad = s->me.scratchpad + 16;
if (s->encoding) {
FF_ALLOCZ_OR_GOTO(s->avctx, s->me.map,
ME_MAP_SIZE * sizeof(uint32_t), fail)
@ -510,10 +535,10 @@ static void backup_duplicate_context(MpegEncContext *bak, MpegEncContext *src)
#undef COPY
}
void ff_update_duplicate_context(MpegEncContext *dst, MpegEncContext *src)
int ff_update_duplicate_context(MpegEncContext *dst, MpegEncContext *src)
{
MpegEncContext bak;
int i;
int i, ret;
// FIXME copy only needed parts
// START_TIMER
backup_duplicate_context(&bak, dst);
@ -522,8 +547,15 @@ void ff_update_duplicate_context(MpegEncContext *dst, MpegEncContext *src)
for (i = 0; i < 12; i++) {
dst->pblocks[i] = &dst->block[i];
}
if (!dst->edge_emu_buffer &&
(ret = ff_mpv_frame_size_alloc(dst, dst->linesize)) < 0) {
av_log(dst->avctx, AV_LOG_ERROR, "failed to allocate context "
"scratch buffers.\n");
return ret;
}
// STOP_TIMER("update_duplicate_context")
// about 10k cycles / 0.01 sec for 1000frames on 1ghz with 2 threads
return 0;
}
int ff_mpeg_update_thread_context(AVCodecContext *dst,
@ -608,6 +640,20 @@ int ff_mpeg_update_thread_context(AVCodecContext *dst,
FF_INPUT_BUFFER_PADDING_SIZE);
}
// linesize dependend scratch buffer allocation
if (!s->edge_emu_buffer)
if (s1->linesize) {
if (ff_mpv_frame_size_alloc(s, s1->linesize) < 0) {
av_log(s->avctx, AV_LOG_ERROR, "Failed to allocate context "
"scratch buffers.\n");
return AVERROR(ENOMEM);
}
} else {
av_log(s->avctx, AV_LOG_ERROR, "Context scratch buffers could not "
"be allocated due to unknown size.\n");
return AVERROR_BUG;
}
// MPEG2/interlacing info
memcpy(&s->progressive_sequence, &s1->progressive_sequence,
(char *) &s1->rtp_mode - (char *) &s1->progressive_sequence);

3
libavcodec/mpegvideo.h
View File

@ -759,6 +759,7 @@ void ff_MPV_common_defaults(MpegEncContext *s);
void ff_MPV_decode_defaults(MpegEncContext *s);
int ff_MPV_common_init(MpegEncContext *s);
int ff_mpv_frame_size_alloc(MpegEncContext *s, int linesize);
int ff_MPV_common_frame_size_change(MpegEncContext *s);
void ff_MPV_common_end(MpegEncContext *s);
void ff_MPV_decode_mb(MpegEncContext *s, DCTELEM block[12][64]);
@ -782,7 +783,7 @@ void ff_write_quant_matrix(PutBitContext *pb, uint16_t *matrix);
void ff_release_unused_pictures(MpegEncContext *s, int remove_current);
int ff_find_unused_picture(MpegEncContext *s, int shared);
void ff_denoise_dct(MpegEncContext *s, DCTELEM *block);
void ff_update_duplicate_context(MpegEncContext *dst, MpegEncContext *src);
int ff_update_duplicate_context(MpegEncContext *dst, MpegEncContext *src);
int ff_MPV_lowest_referenced_row(MpegEncContext *s, int dir);
void ff_MPV_report_decode_progress(MpegEncContext *s);
int ff_mpeg_update_thread_context(AVCodecContext *dst, const AVCodecContext *src);

6
libavcodec/mpegvideo_enc.c
View File

@ -3107,7 +3107,7 @@ static void set_frame_distances(MpegEncContext * s){
static int encode_picture(MpegEncContext *s, int picture_number)
{
int i;
int i, ret;
int bits;
int context_count = s->slice_context_count;
@ -3150,7 +3150,9 @@ static int encode_picture(MpegEncContext *s, int picture_number)
s->mb_intra=0; //for the rate distortion & bit compare functions
for(i=1; i<context_count; i++){
ff_update_duplicate_context(s->thread_context[i], s);
ret = ff_update_duplicate_context(s->thread_context[i], s);
if (ret < 0)
return ret;
}
if(ff_init_me(s)<0)