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drbd: remove check of list iterator against head past the loop body

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When list_for_each_entry() completes the iteration over the whole list
without breaking the loop, the iterator value will be a bogus pointer
computed based on the head element.

While it is safe to use the pointer to determine if it was computed
based on the head element, either with list_entry_is_head() or
&pos->member == head, using the iterator variable after the loop should
be avoided.

In preparation to limit the scope of a list iterator to the list
traversal loop, use a dedicated pointer to point to the found element [1].

Link: https://lore.kernel.org/all/CAHk-=wgRr_D8CB-D9Kg-c=EHreAsk5SqXPwr9Y7k9sA6cWXJ6w@mail.gmail.com/ [1]
Signed-off-by: Jakob Koschel <jakobkoschel@gmail.com>
Reviewed-by: Christoph Böhmwalder <christoph.boehmwalder@linbit.com>
Link: https://lore.kernel.org/r/20220331220349.885126-2-jakobkoschel@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jakob Koschel 2022-04-01 00:03:49 +02:00 committed by Jens Axboe
parent 901aeda62e
commit 2651ee5ae4
1 changed files with 27 additions and 15 deletions
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42
drivers/block/drbd/drbd_req.c
View File

@ -334,17 +334,21 @@ static void set_if_null_req_next(struct drbd_peer_device *peer_device, struct dr
static void advance_conn_req_next(struct drbd_peer_device *peer_device, struct drbd_request *req)
{
struct drbd_connection *connection = peer_device ? peer_device->connection : NULL;
struct drbd_request *iter = req;
if (!connection)
return;
if (connection->req_next != req)
return;
list_for_each_entry_continue(req, &connection->transfer_log, tl_requests) {
const unsigned s = req->rq_state;
if (s & RQ_NET_QUEUED)
req = NULL;
list_for_each_entry_continue(iter, &connection->transfer_log, tl_requests) {
const unsigned int s = iter->rq_state;
if (s & RQ_NET_QUEUED) {
req = iter;
break;
}
}
if (&req->tl_requests == &connection->transfer_log)
req = NULL;
connection->req_next = req;
}
@ -360,17 +364,21 @@ static void set_if_null_req_ack_pending(struct drbd_peer_device *peer_device, st
static void advance_conn_req_ack_pending(struct drbd_peer_device *peer_device, struct drbd_request *req)
{
struct drbd_connection *connection = peer_device ? peer_device->connection : NULL;
struct drbd_request *iter = req;
if (!connection)
return;
if (connection->req_ack_pending != req)
return;
list_for_each_entry_continue(req, &connection->transfer_log, tl_requests) {
const unsigned s = req->rq_state;
if ((s & RQ_NET_SENT) && (s & RQ_NET_PENDING))
req = NULL;
list_for_each_entry_continue(iter, &connection->transfer_log, tl_requests) {
const unsigned int s = iter->rq_state;
if ((s & RQ_NET_SENT) && (s & RQ_NET_PENDING)) {
req = iter;
break;
}
}
if (&req->tl_requests == &connection->transfer_log)
req = NULL;
connection->req_ack_pending = req;
}
@ -386,17 +394,21 @@ static void set_if_null_req_not_net_done(struct drbd_peer_device *peer_device, s
static void advance_conn_req_not_net_done(struct drbd_peer_device *peer_device, struct drbd_request *req)
{
struct drbd_connection *connection = peer_device ? peer_device->connection : NULL;
struct drbd_request *iter = req;
if (!connection)
return;
if (connection->req_not_net_done != req)
return;
list_for_each_entry_continue(req, &connection->transfer_log, tl_requests) {
const unsigned s = req->rq_state;
if ((s & RQ_NET_SENT) && !(s & RQ_NET_DONE))
req = NULL;
list_for_each_entry_continue(iter, &connection->transfer_log, tl_requests) {
const unsigned int s = iter->rq_state;
if ((s & RQ_NET_SENT) && !(s & RQ_NET_DONE)) {
req = iter;
break;
}
}
if (&req->tl_requests == &connection->transfer_log)
req = NULL;
connection->req_not_net_done = req;
}