Merged revisions 243244 via svnmerge from

https://origsvn.digium.com/svn/asterisk/trunk

........
  r243244 | jpeeler | 2010-01-26 12:07:57 -0600 (Tue, 26 Jan 2010) | 12 lines
  
  Fix crash resulting from frames with invalid data pointers.
  
  In ast_frdup the frame data union does not get set to point to malloced memory 
  if the datalen is zero, so make sure to handle the same case in ast_frisolate
  appropriately.
  
  (closes issue #16058)
  Reported by: atis
  Patches: 
        bug16058-fix.patch uploaded by jpeeler (license 325)
  Tested by: atis
........


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.6.1@243246 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/frame.c

@@ -431,6 +431,11 @@ struct ast_frame *ast_frisolate(struct ast_frame *fr)
 	}
 	
 	if (!(fr->mallocd & AST_MALLOCD_DATA))  {
+		if (!fr->datalen) {
+			out->data.uint32 = fr->data.uint32;
+			out->mallocd = AST_MALLOCD_HDR | AST_MALLOCD_SRC;
+			return out;
+		}
 		if (!(newdata = ast_malloc(fr->datalen + AST_FRIENDLY_OFFSET))) {
 			if (out->src != fr->src) {
 				ast_free((void *) out->src);