diff options
| author | Alex Elder <elder@inktank.com> | 2012-12-07 09:57:58 -0600 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-01-17 08:51:20 -0800 |
| commit | 3aa540b869b9bd734ec60246ae1dfe35ab3530e0 (patch) | |
| tree | 16ba9e7dc0e84780777252216fb37f73a7348df7 | |
| parent | 9aaab33ec9b7b9cb745fc47dfe20b991ff468d72 (diff) | |
| download | lwn-3aa540b869b9bd734ec60246ae1dfe35ab3530e0.tar.gz lwn-3aa540b869b9bd734ec60246ae1dfe35ab3530e0.zip | |
libceph: avoid using freed osd in __kick_osd_requests()
If an osd has no requests and no linger requests, __reset_osd()
will just remove it with a call to __remove_osd(). That drops
a reference to the osd, and therefore the osd may have been free
by the time __reset_osd() returns. That function offers no
indication this may have occurred, and as a result the osd will
continue to be used even when it's no longer valid.
Change__reset_osd() so it returns an error (ENODEV) when it
deletes the osd being reset. And change __kick_osd_requests() so it
returns immediately (before referencing osd again) if __reset_osd()
returns *any* error.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>
(cherry picked from commit 685a7555ca69030739ddb57a47f0ea8ea80196a4)
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | net/ceph/osd_client.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c index e03202bdc270..a5735f7c3667 100644 --- a/net/ceph/osd_client.c +++ b/net/ceph/osd_client.c @@ -579,7 +579,7 @@ static void __kick_osd_requests(struct ceph_osd_client *osdc, dout("__kick_osd_requests osd%d\n", osd->o_osd); err = __reset_osd(osdc, osd); - if (err == -EAGAIN) + if (err) return; list_for_each_entry(req, &osd->o_requests, r_osd_item) { @@ -750,6 +750,7 @@ static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd) if (list_empty(&osd->o_requests) && list_empty(&osd->o_linger_requests)) { __remove_osd(osdc, osd); + ret = -ENODEV; } else if (memcmp(&osdc->osdmap->osd_addr[osd->o_osd], &osd->o_con.peer_addr, sizeof(osd->o_con.peer_addr)) == 0 && |