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| author |   Xiaomeng Tong <xiam0nd.tong@gmail.com> | 2022-04-06 21:04:44 +0200 |
|---|---|---|
| committer |   Jens Axboe <axboe@kernel.dk> | 2022-04-06 13:07:52 -0600 |
| commit | ae4d37b5df749926891583d42a6801b5da11e3c1 (patch) | |
| tree | 90cade8b7fa9f51674be457dccd68f53293f7a5a | |
| parent | drbd: Fix five use after free bugs in get_initial_state (diff) | |
| download | linux-dev-ae4d37b5df749926891583d42a6801b5da11e3c1.tar.xz linux-dev-ae4d37b5df749926891583d42a6801b5da11e3c1.zip | |
drbd: fix an invalid memory access caused by incorrect use of list iterator
The bug is here:
idr_remove(&connection->peer_devices, vnr);
If the previous for_each_connection() don't exit early (no goto hit
inside the loop), the iterator 'connection' after the loop will be a
bogus pointer to an invalid structure object containing the HEAD
(&resource->connections). As a result, the use of 'connection' above
will lead to a invalid memory access (including a possible invalid free
as idr_remove could call free_layer).
The original intention should have been to remove all peer_devices,
but the following lines have already done the work. So just remove
this line and the unneeded label, to fix this bug.
Cc: stable@vger.kernel.org
Fixes: c06ece6ba6f1b ("drbd: Turn connection->volumes into connection->peer_devices")
Signed-off-by: Xiaomeng Tong <xiam0nd.tong@gmail.com>
Reviewed-by: Christoph Böhmwalder <christoph.boehmwalder@linbit.com>
Reviewed-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
| -rw-r--r-- | drivers/block/drbd/drbd_main.c | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c index 9676a1d214bc..d6dfa286ddb3 100644 --- a/drivers/block/drbd/drbd_main.c +++ b/drivers/block/drbd/drbd_main.c @@ -2773,12 +2773,12 @@ enum drbd_ret_code drbd_create_device(struct drbd_config_context *adm_ctx, unsig if (init_submitter(device)) { err = ERR_NOMEM; - goto out_idr_remove_vol; + goto out_idr_remove_from_resource; } err = add_disk(disk); if (err) - goto out_idr_remove_vol; + goto out_idr_remove_from_resource; /* inherit the connection state */ device->state.conn = first_connection(resource)->cstate; @@ -2792,8 +2792,6 @@ enum drbd_ret_code drbd_create_device(struct drbd_config_context *adm_ctx, unsig drbd_debugfs_device_add(device); return NO_ERROR; -out_idr_remove_vol: - idr_remove(&connection->peer_devices, vnr); out_idr_remove_from_resource: for_each_connection(connection, resource) { peer_device = idr_remove(&connection->peer_devices, vnr); |