From: Dan Carpenter <dan.carpenter@oracle.com> To: Sage Weil <sage@inktank.com> Cc: "David S. Miller" <davem@davemloft.net>, ceph-devel@vger.kernel.org, netdev@vger.kernel.org, kernel-janitors@vger.kernel.org Subject: [patch 2/2] libceph: potential NULL dereference in ceph_osdc_handle_map() Date: Thu, 15 Aug 2013 08:52:48 +0300 [thread overview] Message-ID: <20130815055248.GB23580@elgon.mountain> (raw) There are two places where we read "nr_maps" if both of them are set to zero then we would hit a NULL dereference here. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> --- I think this is a real bug, but please review my fix for it because I'm not very familiar with this code. diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c index 559a832..56f1fe5 100644 --- a/net/ceph/osd_client.c +++ b/net/ceph/osd_client.c @@ -1786,6 +1786,8 @@ void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg) nr_maps--; } + if (!osdc->osdmap) + goto bad; done: downgrade_write(&osdc->map_sem); ceph_monc_got_osdmap(&osdc->client->monc, osdc->osdmap->epoch);
WARNING: multiple messages have this Message-ID (diff)
From: Dan Carpenter <dan.carpenter@oracle.com> To: Sage Weil <sage@inktank.com> Cc: "David S. Miller" <davem@davemloft.net>, ceph-devel@vger.kernel.org, netdev@vger.kernel.org, kernel-janitors@vger.kernel.org Subject: [patch 2/2] libceph: potential NULL dereference in ceph_osdc_handle_map() Date: Thu, 15 Aug 2013 05:52:48 +0000 [thread overview] Message-ID: <20130815055248.GB23580@elgon.mountain> (raw) There are two places where we read "nr_maps" if both of them are set to zero then we would hit a NULL dereference here. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> --- I think this is a real bug, but please review my fix for it because I'm not very familiar with this code. diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c index 559a832..56f1fe5 100644 --- a/net/ceph/osd_client.c +++ b/net/ceph/osd_client.c @@ -1786,6 +1786,8 @@ void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg) nr_maps--; } + if (!osdc->osdmap) + goto bad; done: downgrade_write(&osdc->map_sem); ceph_monc_got_osdmap(&osdc->client->monc, osdc->osdmap->epoch);
next reply other threads:[~2013-08-15 5:53 UTC|newest] Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top 2013-08-15 5:52 Dan Carpenter [this message] 2013-08-15 5:52 ` [patch 2/2] libceph: potential NULL dereference in ceph_osdc_handle_map() Dan Carpenter
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