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nfs-over-tls: handle res.gid.gid_val correctly for memory allocation

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When the server side nfs-over-tls does an upcall to rpc.tlsservd(8)
for the handshake and the rpc.tlsservd "-u" command line option has
been specified, a list of gids may be returned.
The list will be returned in malloc'd memory pointed to by
res.gid.gid_val. To ensure the malloc occurs, res.gid.gid_val must
be NULL before the call. Then, the malloc'd memory needs to be free'd.
mem_free() just calls free(9), so a NULL pointer argument is fine
and a length argument == 0 is ok, since the "len" argument is not used.

This bug would have only affected nfs-over-tls and only when
rpc.tlsservd(8) is running with the "-u" command line option.
This commit is contained in:
Rick Macklem 2021-01-12 13:59:52 -08:00
parent d2ceee38ca
commit f6dc363f6d
1 changed files with 2 additions and 0 deletions
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2
sys/rpc/rpcsec_tls/rpctls_impl.c
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@ -573,6 +573,7 @@ rpctls_server(SVCXPRT *xprt, struct socket *so, uint32_t *flags, uint64_t *sslp,
mtx_unlock(&rpctls_server_lock);
/* Do the server upcall. */
res.gid.gid_val = NULL;
stat = rpctlssd_connect_1(NULL, &res, cl);
if (stat == RPC_SUCCESS) {
*flags = res.flags;
@ -598,6 +599,7 @@ rpctls_server(SVCXPRT *xprt, struct socket *so, uint32_t *flags, uint64_t *sslp,
soshutdown(so, SHUT_RD);
}
CLNT_RELEASE(cl);
mem_free(res.gid.gid_val, 0);
/* Once the upcall is done, the daemon is done with the fp and so. */
mtx_lock(&rpctls_server_lock);