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Commit b74243c8 authored by Francois Cartegnie's avatar Francois Cartegnie
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demux: mp4 fix memory corruption on CTTS indexes 

refs #11162
parent 7c82aac1
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Showing with 73 additions and 24 deletions
modules/demux/mp4/libmp4.c
View file @ b74243c8
......@@ -1135,8 +1135,8 @@ static int MP4_ReadBox_stts( stream_t *p_stream, MP4_Box_t *p_box )
static void MP4_FreeBox_ctts( MP4_Box_t *p_box )
{
FREENULL( p_box->data.p_ctts->i_sample_count );
FREENULL( p_box->data.p_ctts->i_sample_offset );
FREENULL( p_box->data.p_ctts->pi_sample_count );
FREENULL( p_box->data.p_ctts->pi_sample_offset );
}
static int MP4_ReadBox_ctts( stream_t *p_stream, MP4_Box_t *p_box )
......@@ -1147,21 +1147,24 @@ static int MP4_ReadBox_ctts( stream_t *p_stream, MP4_Box_t *p_box )
MP4_GET4BYTES( p_box->data.p_ctts->i_entry_count );
p_box->data.p_ctts->i_sample_count =
p_box->data.p_ctts->pi_sample_count =
calloc( p_box->data.p_ctts->i_entry_count, sizeof(uint32_t) );
p_box->data.p_ctts->i_sample_offset =
p_box->data.p_ctts->pi_sample_offset =
calloc( p_box->data.p_ctts->i_entry_count, sizeof(int32_t) );
if( ( p_box->data.p_ctts->i_sample_count == NULL )
|| ( p_box->data.p_ctts->i_sample_offset == NULL ) )
if( ( p_box->data.p_ctts->pi_sample_count == NULL )
|| ( p_box->data.p_ctts->pi_sample_offset == NULL ) )
{
MP4_READBOX_EXIT( 0 );
}
for( unsigned int i = 0; (i < p_box->data.p_ctts->i_entry_count )&&( i_read >=8 ); i++ )
uint32_t i = 0;
for( ; (i < p_box->data.p_ctts->i_entry_count )&&( i_read >=8 ); i++ )
{
MP4_GET4BYTES( p_box->data.p_ctts->i_sample_count[i] );
MP4_GET4BYTES( p_box->data.p_ctts->i_sample_offset[i] );
MP4_GET4BYTES( p_box->data.p_ctts->pi_sample_count[i] );
MP4_GET4BYTES( p_box->data.p_ctts->pi_sample_offset[i] );
}
if ( i < p_box->data.p_ctts->i_entry_count )
p_box->data.p_ctts->i_entry_count = i;
#ifdef MP4_VERBOSE
msg_Dbg( p_stream, "read box: \"ctts\" entry-count %d",
......
modules/demux/mp4/libmp4.h
View file @ b74243c8
......@@ -478,8 +478,8 @@ typedef struct MP4_Box_data_ctts_s
uint32_t i_entry_count;
uint32_t *i_sample_count; /* these are array */
int32_t *i_sample_offset;
uint32_t *pi_sample_count; /* these are array */
int32_t *pi_sample_offset;
} MP4_Box_data_ctts_t;
......
modules/demux/mp4/mp4.c
View file @ b74243c8
......@@ -1627,65 +1627,111 @@ static int TrackCreateSamplesIndex( demux_t *p_demux,
{
MP4_Box_data_ctts_t *ctts = p_box->data.p_ctts;
msg_Warn( p_demux, "CTTS table" );
msg_Warn( p_demux, "CTTS table of %"PRIu32" entries", ctts->i_entry_count );
/* Create pts-dts table per chunk */
i_index = 0; i_index_sample_used = 0;
for( i_chunk = 0; i_chunk < p_demux_track->i_chunk_count; i_chunk++ )
{
mp4_chunk_t *ck = &p_demux_track->chunk[i_chunk];
int64_t i_entry, i_sample_count, i;
uint32_t i_entry, i_sample_count, i;
/* count how many entries are needed for this chunk
* for p_sample_delta_dts and p_sample_count_dts */
i_sample_count = ck->i_sample_count;
i_entry = 0;
uint32_t i_array_offset = i_index;
while( i_sample_count > 0 )
{
i_sample_count -= ctts->pi_sample_count[i_index+i_entry];
if ( (UINT32_MAX - i_index) > i_entry )
i_array_offset = i_index + i_entry;
else
i_array_offset = UINT32_MAX;
if ( i_array_offset >= ctts->i_entry_count )
{
msg_Err( p_demux, "invalid index counting total samples %u %u", i_array_offset, ctts->i_entry_count );
return VLC_EGENERIC;
}
if ( i_sample_count > ctts->pi_sample_count[i_array_offset] )
i_sample_count -= ctts->pi_sample_count[i_array_offset];
else
i_sample_count = 0;
/* don't count already used sample in this entry */
if( i_entry == 0 )
i_sample_count += i_index_sample_used;
{
if ( i_index_sample_used < ( UINT32_MAX - i_sample_count ) )
i_sample_count += i_index_sample_used;
}
i_entry++;
if (likely( i_entry != UINT32_MAX ))
i_entry++;
else
{
msg_Err( p_demux, "suspiciously high number of i_entry" );
break; /* likely will go ENOMEM now */
}
}
/* allocate them */
ck->p_sample_count_pts = calloc( i_entry, sizeof( uint32_t ) );
ck->p_sample_offset_pts = calloc( i_entry, sizeof( int32_t ) );
if( !ck->p_sample_count_pts || !ck->p_sample_offset_pts )
{
msg_Err( p_demux, "can't allocate memory for i_entry=%"PRIu32, i_entry );
return VLC_ENOMEM;
}
/* now copy */
i_sample_count = ck->i_sample_count;
for( i = 0; i < i_entry; i++ )
{
int64_t i_used;
int64_t i_rest;
uint32_t i_used;
uint32_t i_rest;
if ( i_index >= ctts->i_entry_count )
{
msg_Err( p_demux, "invalid index total samples" );
return VLC_EGENERIC;
}
i_rest = ctts->pi_sample_count[i_index] -
i_index_sample_used;
if ( i_index_sample_used < ctts->pi_sample_count[i_index] )
i_rest = ctts->pi_sample_count[i_index] - i_index_sample_used;
else
i_rest = 0;
i_used = __MIN( i_rest, i_sample_count );
i_index_sample_used += i_used;
i_sample_count -= i_used;
if ( (UINT32_MAX - i_index_sample_used) > i_used )
i_index_sample_used += i_used;
else
i_index_sample_used = UINT32_MAX;
if ( i_used > i_sample_count )
i_sample_count -= i_used;
else
i_sample_count = 0;
ck->p_sample_count_pts[i] = i_used;
ck->p_sample_offset_pts[i] = ctts->pi_sample_offset[i_index];
if( i_index_sample_used >= ctts->pi_sample_count[i_index] )
{
i_index++;
i_index_sample_used = 0;
if (unlikely( i_index == UINT32_MAX ))
break;
else
i_index++;
}
}
}
}
msg_Dbg( p_demux, "track[Id 0x%x] read %d samples length:%"PRId64"s",
msg_Dbg( p_demux, "track[Id 0x%x] read %"PRIu32" samples length:%"PRId64"s",
p_demux_track->i_track_ID, p_demux_track->i_sample_count,
i_next_dts / p_demux_track->i_timescale );
......
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