block, bfq: initialize active lists for all actuators

Commit 2d31c684a053 ("block, bfq: inject I/O to underutilized
actuators") extended bfqd->active_list from a single list_head to an
array indexed by actuator, but bfq_init_queue() still only initialized
the first two entries:

        INIT_LIST_HEAD(&bfqd->active_list[0]);
        INIT_LIST_HEAD(&bfqd->active_list[1]);

For devices with more than two independent access ranges, the remaining
list heads stay zeroed by kzalloc() and are never set up as empty lists.
When BFQ later adds a bfq_queue to one of those lists, list_add() writes
through head->next, which is NULL, corrupting the list or crashing the
kernel.

Initialize every actuator's active list using bfqd->num_actuators,
which is already set up earlier in bfq_init_queue().

Fixes: 2d31c684a053 ("block, bfq: inject I/O to underutilized actuators")
Signed-off-by: Li RongQing <lirongqing@baidu.com>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Yu Kuai <yukuai@fygo.io>
Link: https://patch.msgid.link/20261019051137.1715-1-lirongqing@baidu.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

0 files changed, 0 insertions, 0 deletions