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dvbsubdec: check memory allocations and propagate errors

tags/n2.6
Vittorio Giovara 11 years ago
parent
e71149a7a5
commit
607ad990d3
1 changed files with 58 additions and 30 deletions
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  1. +58
    -30
      libavcodec/dvbsubdec.c

+ 58
- 30
libavcodec/dvbsubdec.c View File

@@ -832,8 +832,8 @@ static void dvbsub_parse_pixel_data_block(AVCodecContext *avctx, DVBSubObjectDis

}

static void dvbsub_parse_object_segment(AVCodecContext *avctx,
const uint8_t *buf, int buf_size)
static int dvbsub_parse_object_segment(AVCodecContext *avctx,
const uint8_t *buf, int buf_size)
{
DVBSubContext *ctx = avctx->priv_data;

@@ -852,7 +852,7 @@ static void dvbsub_parse_object_segment(AVCodecContext *avctx,
object = get_object(ctx, object_id);

if (!object)
return;
return AVERROR_INVALIDDATA;

coding_method = ((*buf) >> 2) & 3;
non_modifying_color = ((*buf++) >> 1) & 1;
@@ -865,7 +865,7 @@ static void dvbsub_parse_object_segment(AVCodecContext *avctx,

if (buf + top_field_len + bottom_field_len > buf_end) {
av_log(avctx, AV_LOG_ERROR, "Field data size too large\n");
return;
return AVERROR_INVALIDDATA;
}

for (display = object->display_list; display; display = display->object_list_next) {
@@ -889,10 +889,11 @@ static void dvbsub_parse_object_segment(AVCodecContext *avctx,
av_log(avctx, AV_LOG_ERROR, "Unknown object coding %d\n", coding_method);
}

return 0;
}

static void dvbsub_parse_clut_segment(AVCodecContext *avctx,
const uint8_t *buf, int buf_size)
static int dvbsub_parse_clut_segment(AVCodecContext *avctx,
const uint8_t *buf, int buf_size)
{
DVBSubContext *ctx = avctx->priv_data;

@@ -921,6 +922,8 @@ static void dvbsub_parse_clut_segment(AVCodecContext *avctx,

if (!clut) {
clut = av_malloc(sizeof(DVBSubCLUT));
if (!clut)
return AVERROR(ENOMEM);

memcpy(clut, &default_clut, sizeof(DVBSubCLUT));

@@ -937,7 +940,7 @@ static void dvbsub_parse_clut_segment(AVCodecContext *avctx,

if (depth == 0) {
av_log(avctx, AV_LOG_ERROR, "Invalid clut depth 0x%x!\n", *buf);
return;
return AVERROR_INVALIDDATA;
}

full_range = (*buf++) & 1;
@@ -971,11 +974,13 @@ static void dvbsub_parse_clut_segment(AVCodecContext *avctx,
if (depth & 0x20)
clut->clut256[entry_id] = RGBA(r,g,b,255 - alpha);
}

return 0;
}


static void dvbsub_parse_region_segment(AVCodecContext *avctx,
const uint8_t *buf, int buf_size)
static int dvbsub_parse_region_segment(AVCodecContext *avctx,
const uint8_t *buf, int buf_size)
{
DVBSubContext *ctx = avctx->priv_data;

@@ -987,7 +992,7 @@ static void dvbsub_parse_region_segment(AVCodecContext *avctx,
int fill;

if (buf_size < 10)
return;
return AVERROR_INVALIDDATA;

region_id = *buf++;

@@ -995,6 +1000,8 @@ static void dvbsub_parse_region_segment(AVCodecContext *avctx,

if (!region) {
region = av_mallocz(sizeof(DVBSubRegion));
if (!region)
return AVERROR(ENOMEM);

region->id = region_id;

@@ -1015,6 +1022,8 @@ static void dvbsub_parse_region_segment(AVCodecContext *avctx,
region->buf_size = region->width * region->height;

region->pbuf = av_malloc(region->buf_size);
if (!region->pbuf)
return AVERROR(ENOMEM);

fill = 1;
}
@@ -1054,6 +1063,8 @@ static void dvbsub_parse_region_segment(AVCodecContext *avctx,

if (!object) {
object = av_mallocz(sizeof(DVBSubObject));
if (!object)
return AVERROR(ENOMEM);

object->id = object_id;
object->next = ctx->object_list;
@@ -1063,6 +1074,8 @@ static void dvbsub_parse_region_segment(AVCodecContext *avctx,
object->type = (*buf) >> 6;

display = av_mallocz(sizeof(DVBSubObjectDisplay));
if (!display)
return AVERROR(ENOMEM);

display->object_id = object_id;
display->region_id = region_id;
@@ -1083,10 +1096,12 @@ static void dvbsub_parse_region_segment(AVCodecContext *avctx,
display->object_list_next = object->display_list;
object->display_list = display;
}

return 0;
}

static void dvbsub_parse_page_segment(AVCodecContext *avctx,
const uint8_t *buf, int buf_size)
static int dvbsub_parse_page_segment(AVCodecContext *avctx,
const uint8_t *buf, int buf_size)
{
DVBSubContext *ctx = avctx->priv_data;
DVBSubRegionDisplay *display;
@@ -1097,7 +1112,7 @@ static void dvbsub_parse_page_segment(AVCodecContext *avctx,
int page_state;

if (buf_size < 1)
return;
return AVERROR_INVALIDDATA;

ctx->time_out = *buf++;
page_state = ((*buf++) >> 2) & 3;
@@ -1124,8 +1139,11 @@ static void dvbsub_parse_page_segment(AVCodecContext *avctx,
display = display->next;
}

if (!display)
if (!display) {
display = av_mallocz(sizeof(DVBSubRegionDisplay));
if (!display)
return AVERROR(ENOMEM);
}

display->region_id = region_id;

@@ -1151,6 +1169,7 @@ static void dvbsub_parse_page_segment(AVCodecContext *avctx,
av_free(display);
}

return 0;
}


@@ -1204,6 +1223,8 @@ static void save_display_set(DVBSubContext *ctx)
if (x_pos >= 0) {

pbuf = av_malloc(width * height * 4);
if (!pbuf)
return AVERROR(ENOMEM);

for (display = ctx->display_list; display; display = display->next) {
region = get_region(ctx, display->region_id);
@@ -1249,28 +1270,28 @@ static void save_display_set(DVBSubContext *ctx)
}
#endif

static void dvbsub_parse_display_definition_segment(AVCodecContext *avctx,
const uint8_t *buf,
int buf_size)
static int dvbsub_parse_display_definition_segment(AVCodecContext *avctx,
const uint8_t *buf,
int buf_size)
{
DVBSubContext *ctx = avctx->priv_data;
DVBSubDisplayDefinition *display_def = ctx->display_definition;
int dds_version, info_byte;

if (buf_size < 5)
return;
return AVERROR_INVALIDDATA;

info_byte = bytestream_get_byte(&buf);
dds_version = info_byte >> 4;
if (display_def && display_def->version == dds_version)
return; // already have this display definition version
return 0; // already have this display definition version

if (!display_def) {
display_def = av_mallocz(sizeof(*display_def));
if (!display_def)
return AVERROR(ENOMEM);
ctx->display_definition = display_def;
}
if (!display_def)
return;

display_def->version = dds_version;
display_def->x = 0;
@@ -1279,7 +1300,7 @@ static void dvbsub_parse_display_definition_segment(AVCodecContext *avctx,
display_def->height = bytestream_get_be16(&buf) + 1;

if (buf_size < 13)
return;
return AVERROR_INVALIDDATA;

if (info_byte & 1<<3) { // display_window_flag
display_def->x = bytestream_get_be16(&buf);
@@ -1287,10 +1308,12 @@ static void dvbsub_parse_display_definition_segment(AVCodecContext *avctx,
display_def->width = bytestream_get_be16(&buf) - display_def->x + 1;
display_def->height = bytestream_get_be16(&buf) - display_def->y + 1;
}

return 0;
}

static int dvbsub_display_end_segment(AVCodecContext *avctx, const uint8_t *buf,
int buf_size, AVSubtitle *sub)
int buf_size, AVSubtitle *sub)
{
DVBSubContext *ctx = avctx->priv_data;
DVBSubDisplayDefinition *display_def = ctx->display_definition;
@@ -1411,7 +1434,7 @@ static int dvbsub_decode(AVCodecContext *avctx,

if (buf_size <= 6 || *buf != 0x0f) {
av_dlog(avctx, "incomplete or broken packet");
return -1;
return AVERROR_INVALIDDATA;
}

p = buf;
@@ -1432,30 +1455,35 @@ static int dvbsub_decode(AVCodecContext *avctx,

if (page_id == ctx->composition_id || page_id == ctx->ancillary_id ||
ctx->composition_id == -1 || ctx->ancillary_id == -1) {
int ret = 0;
switch (segment_type) {
case DVBSUB_PAGE_SEGMENT:
dvbsub_parse_page_segment(avctx, p, segment_length);
ret = dvbsub_parse_page_segment(avctx, p, segment_length);
break;
case DVBSUB_REGION_SEGMENT:
dvbsub_parse_region_segment(avctx, p, segment_length);
ret = dvbsub_parse_region_segment(avctx, p, segment_length);
break;
case DVBSUB_CLUT_SEGMENT:
dvbsub_parse_clut_segment(avctx, p, segment_length);
ret = dvbsub_parse_clut_segment(avctx, p, segment_length);
break;
case DVBSUB_OBJECT_SEGMENT:
dvbsub_parse_object_segment(avctx, p, segment_length);
ret = dvbsub_parse_object_segment(avctx, p, segment_length);
break;
case DVBSUB_DISPLAYDEFINITION_SEGMENT:
dvbsub_parse_display_definition_segment(avctx, p, segment_length);
ret = dvbsub_parse_display_definition_segment(avctx, p,
segment_length);
break;
case DVBSUB_DISPLAY_SEGMENT:
*data_size = dvbsub_display_end_segment(avctx, p, segment_length, sub);
ret = dvbsub_display_end_segment(avctx, p, segment_length, sub);
*data_size = ret;
break;
default:
av_dlog(avctx, "Subtitling segment type 0x%x, page id %d, length %d\n",
segment_type, page_id, segment_length);
break;
}
if (ret < 0)
return ret;
}

p += segment_length;


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