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Thu, 30 Jul 2020 10:26:58 +0000 (UTC) Date: Thu, 30 Jul 2020 12:26:56 +0200 From: Cornelia Huck To: Halil Pasic Subject: Re: [PATCH 1/1] s390x/s390-virtio-ccw: fix off-by-one in loadparm getter Message-ID: <20200730122656.4942edbb.cohuck@redhat.com> In-Reply-To: <20200729130222.29026-1-pasic@linux.ibm.com> References: <20200729130222.29026-1-pasic@linux.ibm.com> Organization: Red Hat GmbH MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=207.211.31.81; envelope-from=cohuck@redhat.com; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/07/30 03:51:24 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -40 X-Spam_score: -4.1 X-Spam_bar: ---- X-Spam_report: (-4.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell , Thomas Huth , David Hildenbrand , qemu-devel@nongnu.org, Christian Borntraeger , qemu-s390x@nongnu.org, Richard Henderson Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Wed, 29 Jul 2020 15:02:22 +0200 Halil Pasic wrote: > As pointed out by Peter, g_memdup(ms->loadparm, sizeof(ms->loadparm) + 1) > reads one past of the end of ms->loadparm, so g_memdup() can not be used > here. > > Let's use malloc and memcpy instead! Hm, an alternative would be to use g_strndup(). What do you think? > > Fixes: d664548328 ("s390x/s390-virtio-ccw: fix loadparm property getter") > Fixes: Coverity CID 1431058 > Reported-by: Peter Maydell > Signed-off-by: Halil Pasic > --- > hw/s390x/s390-virtio-ccw.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c > index 403d30e13b..8b7bac0392 100644 > --- a/hw/s390x/s390-virtio-ccw.c > +++ b/hw/s390x/s390-virtio-ccw.c > @@ -704,8 +704,8 @@ static char *machine_get_loadparm(Object *obj, Error **errp) > char *loadparm_str; > > /* make a NUL-terminated string */ > - loadparm_str = g_memdup(ms->loadparm, sizeof(ms->loadparm) + 1); > - loadparm_str[sizeof(ms->loadparm)] = 0; > + loadparm_str = g_malloc0(sizeof(ms->loadparm) + 1); > + memcpy(loadparm_str, ms->loadparm, sizeof(ms->loadparm)); > return loadparm_str; > } > > > base-commit: 5772f2b1fc5d00e7e04e01fa28e9081d6550440a