[src/trunk]: src/sys/netipsec Fix uninitialized variable: in ipsec_checkpcbca...

[maxv <maxv%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/5591612ab9db
branches:  trunk
changeset: 842520:5591612ab9db
user:      maxv <maxv%NetBSD.org@localhost>
date:      Tue Jul 09 16:56:24 2019 +0000

description:
Fix uninitialized variable: in ipsec_checkpcbcache(), spidx.dir is not
initialized, and the padding of the spidx structure is not initialized
either. This causes the memcmp() to wrongfully fail.

Change ipsec_setspidx() to always initialize spdix.dir and zero out the
padding.

ok ozaki-r@

diffstat:

 sys/netipsec/ipsec.c |  22 +++++++++++++---------
 1 files changed, 13 insertions(+), 9 deletions(-)

diffs (86 lines):

diff -r 466635189303 -r 5591612ab9db sys/netipsec/ipsec.c
--- a/sys/netipsec/ipsec.c      Tue Jul 09 16:25:05 2019 +0000
+++ b/sys/netipsec/ipsec.c      Tue Jul 09 16:56:24 2019 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: ipsec.c,v 1.168 2019/01/27 02:08:48 pgoyette Exp $ */
+/* $NetBSD: ipsec.c,v 1.169 2019/07/09 16:56:24 maxv Exp $ */
 /* $FreeBSD: ipsec.c,v 1.2.2.2 2003/07/01 01:38:13 sam Exp $ */
 /* $KAME: ipsec.c,v 1.103 2001/05/24 07:14:18 sakane Exp $ */
 
@@ -32,7 +32,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: ipsec.c,v 1.168 2019/01/27 02:08:48 pgoyette Exp $");
+__KERNEL_RCSID(0, "$NetBSD: ipsec.c,v 1.169 2019/07/09 16:56:24 maxv Exp $");
 
 /*
  * IPsec controller part.
@@ -172,7 +172,7 @@
 #endif
 
 static int ipsec_setspidx_inpcb(struct mbuf *, void *);
-static int ipsec_setspidx(struct mbuf *, struct secpolicyindex *, int);
+static int ipsec_setspidx(struct mbuf *, struct secpolicyindex *, int, int);
 static void ipsec4_get_ulp(struct mbuf *m, struct secpolicyindex *, int);
 static int ipsec4_setspidx_ipaddr(struct mbuf *, struct secpolicyindex *);
 #ifdef INET6
@@ -220,7 +220,7 @@
        }
        if ((pcbsp->sp_cacheflags & IPSEC_PCBSP_CONNECTED) == 0) {
                /* NB: assume ipsec_setspidx never sleep */
-               if (ipsec_setspidx(m, &spidx, 1) != 0) {
+               if (ipsec_setspidx(m, &spidx, dir, 1) != 0) {
                        sp = NULL;
                        goto out;
                }
@@ -269,7 +269,7 @@
 
        pcbsp->sp_cache[dir].cachesp = NULL;
        pcbsp->sp_cache[dir].cachehint = IPSEC_PCBHINT_UNKNOWN;
-       if (ipsec_setspidx(m, &pcbsp->sp_cache[dir].cacheidx, 1) != 0) {
+       if (ipsec_setspidx(m, &pcbsp->sp_cache[dir].cacheidx, dir, 1) != 0) {
                return EINVAL;
        }
        pcbsp->sp_cache[dir].cachesp = sp;
@@ -537,7 +537,7 @@
        sp = NULL;
 
        /* Make an index to look for a policy. */
-       *error = ipsec_setspidx(m, &spidx, (flag & IP_FORWARDING) ? 0 : 1);
+       *error = ipsec_setspidx(m, &spidx, dir, (flag & IP_FORWARDING) ? 0 : 1);
        if (*error != 0) {
                IPSECLOG(LOG_DEBUG, "setpidx failed, dir %u flag %u\n", dir, flag);
                memset(&spidx, 0, sizeof(spidx));
@@ -791,9 +791,9 @@
        KASSERT(inph->inph_sp->sp_out != NULL);
        KASSERT(inph->inph_sp->sp_in != NULL);
 
-       error = ipsec_setspidx(m, &inph->inph_sp->sp_in->spidx, 1);
+       error = ipsec_setspidx(m, &inph->inph_sp->sp_in->spidx,
+           IPSEC_DIR_INBOUND, 1);
        if (error == 0) {
-               inph->inph_sp->sp_in->spidx.dir = IPSEC_DIR_INBOUND;
                inph->inph_sp->sp_out->spidx = inph->inph_sp->sp_in->spidx;
                inph->inph_sp->sp_out->spidx.dir = IPSEC_DIR_OUTBOUND;
        } else {
@@ -811,7 +811,8 @@
  * the caller is responsible for error recovery (like clearing up spidx).
  */
 static int
-ipsec_setspidx(struct mbuf *m, struct secpolicyindex *spidx, int needport)
+ipsec_setspidx(struct mbuf *m, struct secpolicyindex *spidx, int dir,
+    int needport)
 {
        struct ip *ip = NULL;
        struct ip ipbuf;
@@ -828,6 +829,9 @@
                return EINVAL;
        }
 
+       memset(spidx, 0, sizeof(*spidx));
+       spidx->dir = dir;
+
        if (m->m_len >= sizeof(*ip)) {
                ip = mtod(m, struct ip *);
        } else {