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null_blk: mem garbage on NUMA systems during init

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For NUMA systems, initializing the blk-mq layer and using per node hctx.
We initialize submit queues to 1, while blk-mq nr_hw_queues is
initialized to the number of NUMA nodes.

This makes the null_init_hctx function overwrite memory outside of what
it allocated.  In my case it lead to writing garbage into struct
request_queue's mq_map.

Signed-off-by: Matias Bjorling <[email protected]>
Cc: Jens Axboe <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Matias Bjorling authored and Linus Torvalds committed 2013-12-15 12:17:16 -08:00
1 parent e4158f1b10
commit 57053d8c5c
1 file changed
+4 -4
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drivers/block/null_blk.c
+4 -4
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@@ -495,23 +495,23 @@ static int null_add_dev(void)
spin_lock_init(&nullb->lock);
if (queue_mode == NULL_Q_MQ && use_per_node_hctx)
submit_queues = nr_online_nodes;
if (setup_queues(nullb))
goto err;
if (queue_mode == NULL_Q_MQ) {
null_mq_reg.numa_node = home_node;
null_mq_reg.queue_depth = hw_queue_depth;
null_mq_reg.nr_hw_queues = submit_queues;
if (use_per_node_hctx) {
null_mq_reg.ops->alloc_hctx = null_alloc_hctx;
null_mq_reg.ops->free_hctx = null_free_hctx;
null_mq_reg.nr_hw_queues = nr_online_nodes;
} else {
null_mq_reg.ops->alloc_hctx = blk_mq_alloc_single_hw_queue;
null_mq_reg.ops->free_hctx = blk_mq_free_single_hw_queue;
null_mq_reg.nr_hw_queues = submit_queues;
}
nullb->q = blk_mq_init_queue(&null_mq_reg, nullb);