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| author | Sage Weil <sage@inktank.com> | 2012-10-24 16:12:58 -0700 |
|---|---|---|
| committer | Sage Weil <sage@inktank.com> | 2012-10-24 16:19:19 -0700 |
| commit | 9bd952615a42d7e2ce3fa2c632e808e804637a1a (patch) | |
| tree | 7eb86ac8c5f00f160cf5dc23d1a5d89ab951fcd5 | |
| parent | 588377d6199034c36d335e7df5818b731fea072c (diff) | |
| download | linux-9bd952615a42d7e2ce3fa2c632e808e804637a1a.tar.gz linux-9bd952615a42d7e2ce3fa2c632e808e804637a1a.tar.bz2 linux-9bd952615a42d7e2ce3fa2c632e808e804637a1a.zip | |
libceph: avoid NULL kref_put when osd reset races with alloc_msg
The ceph_on_in_msg_alloc() method drops con->mutex while it allocates a
message. If that races with a timeout that resends a zillion messages and
resets the connection, and the ->alloc_msg() method returns a NULL message,
it will call ceph_msg_put(NULL) and BUG.
Fix by only calling put if msg is non-NULL.
Fixes http://tracker.newdream.net/issues/3142
Signed-off-by: Sage Weil <sage@inktank.com>
| -rw-r--r-- | net/ceph/messenger.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c index cad0d17ec45e..3ef1759403b4 100644 --- a/net/ceph/messenger.c +++ b/net/ceph/messenger.c @@ -2750,7 +2750,8 @@ static int ceph_con_in_msg_alloc(struct ceph_connection *con, int *skip) msg = con->ops->alloc_msg(con, hdr, skip); mutex_lock(&con->mutex); if (con->state != CON_STATE_OPEN) { - ceph_msg_put(msg); + if (msg) + ceph_msg_put(msg); return -EAGAIN; } con->in_msg = msg; |