fix possible infinite loop

git-svn: trunk@1087

clamav-devel/ChangeLog

@@ -1,3 +1,7 @@
+Fri Nov 12 15:31:15 GMT 2004 (trog)
+-----------------------------------
+  * libclamav/vba_extract.c: fix possible infinite loop
+
 Fri Nov 12 09:44:23 GMT 2004 (njh)
 ----------------------------------
   * libclamav/mbox.c:		Draft of RFC1341 support is now on by default.

clamav-devel/libclamav/vba_extract.c

@@ -827,6 +827,12 @@ static char *ppt_stream_iter(int fd)
 		}
 		ppt_print_atom_header(&atom_header);
 
+		if (atom_header.length <= 0) {
+			cli_rmdirs(out_dir);
+			free(out_dir);
+			return NULL;
+		}
+
 		if (atom_header.type == 0x1011) {
 			if (cli_readn(fd, &ole_id, 4) != 4) {
 				cli_dbgmsg("read ole_id failed\n");