A less complete version of this patch was fed back to the upstream community:

http://code.google.com/p/libarchive/issues/detail?id=285

This more complete patch was committed instead.  It should no longer be

needed with the next release.

--- libarchive/libarchive/archive_write_set_format_pax.c.orig	Mon Mar 26 19:49:00 2012

+++ libarchive/libarchive/archive_write_set_format_pax.c	Sun Dec  2 04:03:38 2012

@@ -647,8 +647,10 @@ archive_write_pax_header(struct archive_write *a,

		oname = archive_entry_pathname(entry_original);

		name_length = strlen(oname);

		name = malloc(name_length + 3);

-		if (name == NULL) {

+		if (name == NULL || extra == NULL) {

			/* XXX error message */

+			archive_entry_free(extra);

+			free(name);

			return (ARCHIVE_FAILED);

		}

		strcpy(name, oname);

@@ -687,6 +689,7 @@ archive_write_pax_header(struct archive_write *a,

		/* Recurse to write the special copyfile entry. */

		r = archive_write_pax_header(a, extra);

+		archive_entry_free(extra);

		if (r < ARCHIVE_WARN)

			return (r);

		if (r < ret)