File vlc-buffer_overflow_in_real_demuxer.patch of Package vlc

File vlc-buffer_overflow_in_real_demuxer.patch of Package vlc (Revision 5)

Currently displaying revision 5, show latest

diff -Nur vlc-1.1.5-orig/modules/demux/real.c vlc-1.1.5/modules/demux/real.c
--- vlc-1.1.5-orig/modules/demux/real.c	2010-12-31 18:54:19.593763216 +0100
+++ vlc-1.1.5/modules/demux/real.c	2010-12-31 19:00:41.758761481 +0100
@@ -252,11 +252,9 @@
             if( tk->p_subpackets[ j ] )
                 block_Release( tk->p_subpackets[ j ] );
         }
-        if( tk->i_subpackets )
-        {
-            free( tk->p_subpackets );
-            free( tk->p_subpackets_timecode );
-        }
+
+        free( tk->p_subpackets );
+        free( tk->p_subpackets_timecode );
         if( tk->p_sipr_packet )
             block_Release( tk->p_sipr_packet );
         free( tk );
@@ -637,6 +635,11 @@
 
         for( int i = 0; i < i_num; i++ )
         {
+            int i_index = tk->i_subpacket_h * i +
+                          ((tk->i_subpacket_h + 1) / 2) * (y&1) + (y>>1);
+            if( i_index >= tk->i_subpackets )
+                return;
+
             block_t *p_block = block_New( p_demux, tk->i_subpacket_size );
             if( !p_block )
                 return;
@@ -649,9 +652,6 @@
 
             p_buf += tk->i_subpacket_size;
 
-            int i_index = tk->i_subpacket_h * i +
-                          ((tk->i_subpacket_h + 1) / 2) * (y&1) + (y>>1);
-
             if( tk->p_subpackets[i_index] != NULL )
             {
                 msg_Dbg(p_demux, "p_subpackets[ %d ] not null!",  i_index );
@@ -671,14 +671,16 @@
 
         for( int i = 0; i < tk->i_subpacket_h / 2; i++ )
         {
+            int i_index = (i * 2 * tk->i_frame_size / tk->i_coded_frame_size) + y;
+            if( i_index >= tk->i_subpackets )
+                return;
+
             block_t *p_block = block_New( p_demux, tk->i_coded_frame_size);
             if( !p_block )
                 return;
             if( &p_buf[tk->i_coded_frame_size] > &p_sys->buffer[p_sys->i_buffer] )
                 return;
 
-            int i_index = (i * 2 * tk->i_frame_size / tk->i_coded_frame_size) + y;
-
             memcpy( p_block->p_buffer, p_buf, tk->i_coded_frame_size );
             p_block->i_dts =
             p_block->i_pts = i_index == 0 ? i_pts : VLC_TS_INVALID;