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libceph: potential NULL dereference in ceph_osdc_handle_map() 

commit b72e19b9225d4297a18715b0998093d843d170fa upstream.

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>
Reviewed-by: Sage Weil <sage@inktank.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dan Carpenter 2013-08-15 08:52:48 +03:00 committed by Greg Kroah-Hartman
parent e9e4b13abe
commit 53341d7de3
1 changed files with 2 additions and 0 deletions
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2
net/ceph/osd_client.c
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@ -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);