netdev - [patch 2/2] libceph: potential NULL dereference in ceph_osdc_handle

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Date:	Thu, 15 Aug 2013 08:52:48 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Sage Weil <sage@...tank.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	ceph-devel@...r.kernel.org, netdev@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [patch 2/2] libceph: potential NULL dereference in
 ceph_osdc_handle_map()

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@...cle.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);
--
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