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libceph: unregister only registered linger requests 

Linger requests that have not yet been registered should not be
unregistered by __unregister_linger_request().  This messes up ref
count and leads to use-after-free.

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Alex Elder <elder@linaro.org>
This commit is contained in:
Ilya Dryomov 2014-06-20 18:29:20 +04:00
parent 7c6e6fc53e
commit af59306455
1 changed files with 14 additions and 5 deletions
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19
net/ceph/osd_client.c
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@ -1248,7 +1248,9 @@ static void __cancel_request(struct ceph_osd_request *req)
static void __register_linger_request(struct ceph_osd_client *osdc,
struct ceph_osd_request *req)
{
dout("__register_linger_request %p\n", req);
dout("%s %p tid %llu\n", __func__, req, req->r_tid);
WARN_ON(!req->r_linger);
ceph_osdc_get_request(req);
list_add_tail(&req->r_linger_item, &osdc->req_linger);
if (req->r_osd)
@ -1259,8 +1261,17 @@ static void __register_linger_request(struct ceph_osd_client *osdc,
static void __unregister_linger_request(struct ceph_osd_client *osdc,
struct ceph_osd_request *req)
{
dout("__unregister_linger_request %p\n", req);
WARN_ON(!req->r_linger);
if (list_empty(&req->r_linger_item)) {
dout("%s %p tid %llu not registered\n", __func__, req,
req->r_tid);
return;
}
dout("%s %p tid %llu\n", __func__, req, req->r_tid);
list_del_init(&req->r_linger_item);
if (req->r_osd) {
list_del_init(&req->r_linger_osd_item);
maybe_move_osd_to_lru(osdc, req->r_osd);
@ -1274,10 +1285,8 @@ void ceph_osdc_unregister_linger_request(struct ceph_osd_client *osdc,
struct ceph_osd_request *req)
{
mutex_lock(&osdc->request_mutex);
if (req->r_linger) {
req->r_linger = 0;
if (req->r_linger)
__unregister_linger_request(osdc, req);
}
mutex_unlock(&osdc->request_mutex);
}
EXPORT_SYMBOL(ceph_osdc_unregister_linger_request);