xdr_string: don't leak strings with xdr_freeHEADmain

Historically (and in a small amount of older software such as OpenAFS),
developers would attempt to free XDR strings with

	xdr_free((xdrproc_t)xdr_string, &string)

This resulted in xdr_free calling xdr_string with only two intentional
arguments and whatever was left in the third argument register.  If the
register held a sufficently small number, xdr_string would return FALSE
and not free the string (no one checks the return values).

Software should instead free strings with:

	xdr_free((xdrproc_t)xdr_wrapstring, &string)

Because buggy software exists in the wild, act as though xdr_wrapstring
was used in the XDR_FREE case and plug these leaks.

Reviewed by:	kib
MFC after:	3 days
Effort:		CHERI upstreaming
Sponsored by:	Innovate UK
Differential Revision:	https://reviews.freebsd.org/D54825

0 files changed, 0 insertions, 0 deletions