[src/trunk]: src/sys/dev/ic Fix a double free. "Suggested" by Brainy.

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

details:   https://anonhg.NetBSD.org/src/rev/04b82b3a0731
branches:  trunk
changeset: 337297:04b82b3a0731
user:      maxv <maxv%NetBSD.org@localhost>
date:      Fri Apr 10 11:47:12 2015 +0000

description:
Fix a double free. "Suggested" by Brainy.

ok rjs@ riastradh@

diffstat:

 sys/dev/ic/bwi.c |  6 ++----
 1 files changed, 2 insertions(+), 4 deletions(-)

diffs (34 lines):

diff -r a7af872c3aff -r 04b82b3a0731 sys/dev/ic/bwi.c
--- a/sys/dev/ic/bwi.c  Fri Apr 10 11:04:58 2015 +0000
+++ b/sys/dev/ic/bwi.c  Fri Apr 10 11:47:12 2015 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: bwi.c,v 1.25 2015/01/07 07:05:48 ozaki-r Exp $ */
+/*     $NetBSD: bwi.c,v 1.26 2015/04/10 11:47:12 maxv Exp $    */
 /*     $OpenBSD: bwi.c,v 1.74 2008/02/25 21:13:30 mglocker Exp $       */
 
 /*
@@ -48,7 +48,7 @@
 
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: bwi.c,v 1.25 2015/01/07 07:05:48 ozaki-r Exp $");
+__KERNEL_RCSID(0, "$NetBSD: bwi.c,v 1.26 2015/04/10 11:47:12 maxv Exp $");
 
 #include <sys/param.h>
 #include <sys/callout.h>
@@ -9140,7 +9140,6 @@
 
                MGETHDR(m_new, M_DONTWAIT, MT_DATA);
                if (m_new == NULL) {
-                       m_freem(m);
                        error = ENOBUFS;
                        aprint_error_dev(sc->sc_dev,
                            "can't defrag TX buffer (1)\n");
@@ -9151,7 +9150,6 @@
                if (m->m_pkthdr.len > MHLEN) {
                        MCLGET(m_new, M_DONTWAIT);
                        if (!(m_new->m_flags & M_EXT)) {
-                               m_freem(m);
                                m_freem(m_new);
                                error = ENOBUFS;
                        }