From eeb7f00f6021626247d8870506edf5ae7b303e52 Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@lst.de>
Date: Mon, 9 Aug 2021 08:40:26 +0200
Subject: [PATCH] bcache: add proper error unwinding in bcache_device_init
Git-commit: 224b0683228c5f332f9cee615d85e75e9a347170
Patch-mainline: v5.15-rc1
References: stable-5.14.4

[ Upstream commit 224b0683228c5f332f9cee615d85e75e9a347170 ]

Except for the IDA none of the allocations in bcache_device_init is
unwound on error, fix that.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Coly Li <colyli@suse.de>
Link: https://lore.kernel.org/r/20210809064028.1198327-7-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/md/bcache/super.c | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index 185246a0d855..d0f08e946453 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -931,20 +931,20 @@ static int bcache_device_init(struct bcache_device *d, unsigned int block_size,
 	n = BITS_TO_LONGS(d->nr_stripes) * sizeof(unsigned long);
 	d->full_dirty_stripes = kvzalloc(n, GFP_KERNEL);
 	if (!d->full_dirty_stripes)
-		return -ENOMEM;
+		goto out_free_stripe_sectors_dirty;
 
 	idx = ida_simple_get(&bcache_device_idx, 0,
 				BCACHE_DEVICE_IDX_MAX, GFP_KERNEL);
 	if (idx < 0)
-		return idx;
+		goto out_free_full_dirty_stripes;
 
 	if (bioset_init(&d->bio_split, 4, offsetof(struct bbio, bio),
 			BIOSET_NEED_BVECS|BIOSET_NEED_RESCUER))
-		goto err;
+		goto out_ida_remove;
 
 	d->disk = blk_alloc_disk(NUMA_NO_NODE);
 	if (!d->disk)
-		goto err;
+		goto out_bioset_exit;
 
 	set_capacity(d->disk, sectors);
 	snprintf(d->disk->disk_name, DISK_NAME_LEN, "bcache%i", idx);
@@ -987,8 +987,14 @@ static int bcache_device_init(struct bcache_device *d, unsigned int block_size,
 
 	return 0;
 
-err:
+out_bioset_exit:
+	bioset_exit(&d->bio_split);
+out_ida_remove:
 	ida_simple_remove(&bcache_device_idx, idx);
+out_free_full_dirty_stripes:
+	kvfree(d->full_dirty_stripes);
+out_free_stripe_sectors_dirty:
+	kvfree(d->stripe_sectors_dirty);
 	return -ENOMEM;
 
 }
-- 
2.26.2