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skd: error pointer dereference in skd_cons_disk()
My initial impulse was to check for IS_ERR_OR_NULL() but when I looked
at this code a bit more closely, we should only need to check for
IS_ERR().
The blk_mq_alloc_tag_set() returns negative error codes and zero on
success so we can just do an "if (rc) goto err_out;". It's better to
preserve the error code anyhow. The blk_mq_init_queue() returns error
pointers on failure, it never returns NULL. We can also remove the
"q = NULL;" at the start because that's no longer needed.
Fixes: ca33dd9296
("skd: Convert to blk-mq")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
parent
c0b3dda7ed
commit
92d499d490
1 changed files with 7 additions and 8 deletions
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@ -2862,7 +2862,6 @@ static int skd_cons_disk(struct skd_device *skdev)
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disk->fops = &skd_blockdev_ops;
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disk->private_data = skdev;
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q = NULL;
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memset(&skdev->tag_set, 0, sizeof(skdev->tag_set));
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skdev->tag_set.ops = &skd_mq_ops;
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skdev->tag_set.nr_hw_queues = 1;
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@ -2874,13 +2873,13 @@ static int skd_cons_disk(struct skd_device *skdev)
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BLK_MQ_F_SG_MERGE |
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BLK_ALLOC_POLICY_TO_MQ_FLAG(BLK_TAG_ALLOC_FIFO);
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skdev->tag_set.driver_data = skdev;
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if (blk_mq_alloc_tag_set(&skdev->tag_set) >= 0) {
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q = blk_mq_init_queue(&skdev->tag_set);
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if (!q)
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blk_mq_free_tag_set(&skdev->tag_set);
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}
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if (!q) {
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rc = -ENOMEM;
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rc = blk_mq_alloc_tag_set(&skdev->tag_set);
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if (rc)
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goto err_out;
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q = blk_mq_init_queue(&skdev->tag_set);
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if (IS_ERR(q)) {
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blk_mq_free_tag_set(&skdev->tag_set);
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rc = PTR_ERR(q);
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goto err_out;
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}
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blk_queue_bounce_limit(q, BLK_BOUNCE_HIGH);
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