Add string length checking to function COM_StripExtension. This fixes the R_RemapShader buffer overflow exploit that can be found here:

http://milw0rm.com/exploits/1750

code/ui/ui_main.c

@@ -4958,7 +4958,7 @@ static void UI_BuildQ3Model_List( void )
 	int		numfiles;
 	char	dirlist[2048];
 	char	filelist[2048];
-	char	skinname[64];
+	char	skinname[MAX_QPATH];
 	char	scratch[256];
 	char*	dirptr;
 	char*	fileptr;
@@ -4988,7 +4988,7 @@ static void UI_BuildQ3Model_List( void )
 		{
 			filelen = strlen(fileptr);
 
-			COM_StripExtension(fileptr,skinname);
+			COM_StripExtension(fileptr, skinname, sizeof(skinname));
 
 			// look for icon_????
 			if (Q_stricmpn(skinname, "icon_", 5) == 0 && !(Q_stricmp(skinname,"icon_blue") == 0 || Q_stricmp(skinname,"icon_red") == 0))

code/ui/ui_players.c

@@ -90,13 +90,13 @@ tryagain:
 
 	if ( weaponNum == WP_MACHINEGUN || weaponNum == WP_GAUNTLET || weaponNum == WP_BFG ) {
 		strcpy( path, item->world_model[0] );
-		COM_StripExtension( path, path );
+		COM_StripExtension(path, path, sizeof(path));
 		strcat( path, "_barrel.md3" );
 		pi->barrelModel = trap_R_RegisterModel( path );
 	}
 
 	strcpy( path, item->world_model[0] );
-	COM_StripExtension( path, path );
+	COM_StripExtension(path, path, sizeof(path));
 	strcat( path, "_flash.md3" );
 	pi->flashModel = trap_R_RegisterModel( path );