linux-kernel - [PATCH 4.18 014/145] block: blk_init_allocated_queue() set q->fq as NULL in the fail case

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Date:   Fri,  7 Sep 2018 23:08:00 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Ming Lei <ming.lei@...hat.com>,
        Bart Van Assche <bart.vanassche@....com>,
        xiao jin <jin.xiao@...el.com>, Jens Axboe <axboe@...nel.dk>
Subject: [PATCH 4.18 014/145] block: blk_init_allocated_queue() set q->fq as NULL in the fail case

4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: xiao jin <jin.xiao@...el.com>

commit 54648cf1ec2d7f4b6a71767799c45676a138ca24 upstream.

We find the memory use-after-free issue in __blk_drain_queue()
on the kernel 4.14. After read the latest kernel 4.18-rc6 we
think it has the same problem.

Memory is allocated for q->fq in the blk_init_allocated_queue().
If the elevator init function called with error return, it will
run into the fail case to free the q->fq.

Then the __blk_drain_queue() uses the same memory after the free
of the q->fq, it will lead to the unpredictable event.

The patch is to set q->fq as NULL in the fail case of
blk_init_allocated_queue().

Fixes: commit 7c94e1c157a2 ("block: introduce blk_flush_queue to drive flush machinery")
Cc: <stable@...r.kernel.org>
Reviewed-by: Ming Lei <ming.lei@...hat.com>
Reviewed-by: Bart Van Assche <bart.vanassche@....com>
Signed-off-by: xiao jin <jin.xiao@...el.com>
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 block/blk-core.c |    1 +
 1 file changed, 1 insertion(+)

--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1180,6 +1180,7 @@ out_exit_flush_rq:
 		q->exit_rq_fn(q, q->fq->flush_rq);
 out_free_flush_queue:
 	blk_free_flush_queue(q->fq);
+	q->fq = NULL;
 	return -ENOMEM;
 }
 EXPORT_SYMBOL(blk_init_allocated_queue);