[src/trunk]: src/sys/net/npf Add error checking for previous memory allocatio...

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

details:   https://anonhg.NetBSD.org/src/rev/6f50b22bee6e
branches:  trunk
changeset: 457354:6f50b22bee6e
user:      christos <christos%NetBSD.org@localhost>
date:      Thu Jun 20 17:12:37 2019 +0000

description:
Add error checking for previous memory allocation failure.

diffstat:

 sys/net/npf/npf_tableset.c |  12 +++++++++---
 1 files changed, 9 insertions(+), 3 deletions(-)

diffs (50 lines):

diff -r 096fb4b214bb -r 6f50b22bee6e sys/net/npf/npf_tableset.c
--- a/sys/net/npf/npf_tableset.c        Thu Jun 20 17:08:52 2019 +0000
+++ b/sys/net/npf/npf_tableset.c        Thu Jun 20 17:12:37 2019 +0000
@@ -39,7 +39,7 @@
 
 #ifdef _KERNEL
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: npf_tableset.c,v 1.31 2019/06/20 17:08:52 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD: npf_tableset.c,v 1.32 2019/06/20 17:12:37 christos Exp $");
 
 #include <sys/param.h>
 #include <sys/types.h>
@@ -495,7 +495,7 @@
        return 0;
 }
 
-static void
+static int
 table_ifaddr_insert(npf_table_t *t, const int alen, npf_tblent_t *ent)
 {
        const unsigned aidx = NPF_ADDRLEN2IDX(alen);
@@ -514,6 +514,9 @@
                newsize = toalloc * sizeof(npf_tblent_t *);
 
                elements = kmem_zalloc(newsize, KM_NOSLEEP);
+               if (elements == NULL) {
+                       return ENOMEM;
+               }
                for (unsigned i = 0; i < used; i++) {
                        elements[i] = old_elements[i];
                }
@@ -527,6 +530,7 @@
        }
        t->t_elements[aidx][used] = ent;
        t->t_used[aidx]++;
+       return 0;
 }
 
 /*
@@ -590,7 +594,9 @@
                error = EINVAL;
                break;
        case NPF_TABLE_IFADDR:
-               table_ifaddr_insert(t, alen, ent);
+               if ((error = table_ifaddr_insert(t, alen, ent)) != 0) {
+                       break;
+               }
                LIST_INSERT_HEAD(&t->t_list, ent, te_listent);
                t->t_nitems++;
                break;