[PATCH 1/2] null_blk: Fix an error handling path in null_add_dev()

[Christophe JAILLET]

In case of error, call to ida_simple_get() must be undone in the error
handling path.

Fixes: a0725ab0c753 ("Merge branch 'for-4.14/block' of git://git.kernel.dk/linux-block")
Signed-off-by: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>
---
 drivers/block/null_blk/main.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/block/null_blk/main.c b/drivers/block/null_blk/main.c
index 05b1120e6623..a330a118659d 100644
--- a/drivers/block/null_blk/main.c
+++ b/drivers/block/null_blk/main.c
@@ -2074,6 +2074,7 @@ static int null_add_dev(struct nullb_device *dev)
 	return 0;
 out_cleanup_zone:
 	null_free_zoned_dev(dev);
+	ida_free(&nullb_indexes, nullb->index);
 out_cleanup_disk:
 	blk_cleanup_disk(nullb->disk);
 out_cleanup_tags:
-- 
2.32.0