linux-kernel - [PATCH v2] btrfs: fix memory leaks when rejecting a non SINGLE data profile without an RST

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Message-ID: <20251008074031.17830-1-mssola@mssola.com>
Date: Wed,  8 Oct 2025 09:40:31 +0200
From: Miquel Sabaté Solà <mssola@...ola.com>
To: linux-btrfs@...r.kernel.org
Cc: clm@...com,
	dsterba@...e.com,
	naohiro.aota@....com,
	boris@....io,
	johannes.thumshirn@....com,
	linux-kernel@...r.kernel.org,
	Miquel Sabaté Solà <mssola@...ola.com>
Subject: [PATCH v2] btrfs: fix memory leaks when rejecting a non SINGLE data profile without an RST

At the end of btrfs_load_block_group_zone_info() the first thing we do
is to ensure that if the mapping type is not a SINGLE one and there is
no RAID stripe tree, then we return early with an error.

Doing that, though, prevents the code from running the last calls from
this function which are about freeing memory allocated during its
run. Hence, in this case, instead of returning early, we set the ret
value and fall through the rest of the cleanup code.

Fixes: 5906333cc4af ("btrfs: zoned: don't skip block group profile checks on conventional zones")
Signed-off-by: Miquel Sabaté Solà <mssola@...ola.com>
---
 fs/btrfs/zoned.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/fs/btrfs/zoned.c b/fs/btrfs/zoned.c
index e3341a84f4ab..8f767a6cd49b 100644
--- a/fs/btrfs/zoned.c
+++ b/fs/btrfs/zoned.c
@@ -1753,7 +1753,11 @@ int btrfs_load_block_group_zone_info(struct btrfs_block_group *cache, bool new)
 	    !fs_info->stripe_root) {
 		btrfs_err(fs_info, "zoned: data %s needs raid-stripe-tree",
 			  btrfs_bg_type_to_raid_name(map->type));
-		return -EINVAL;
+		/*
+		 * Note that this might be overwritten by later if statements,
+		 * but the error will be at least printed by the line above.
+		 */
+		ret = -EINVAL;
 	}
 
 	if (unlikely(cache->alloc_offset > cache->zone_capacity)) {
@@ -1785,6 +1789,7 @@ int btrfs_load_block_group_zone_info(struct btrfs_block_group *cache, bool new)
 		btrfs_free_chunk_map(cache->physical_map);
 		cache->physical_map = NULL;
 	}
+
 	bitmap_free(active);
 	kfree(zone_info);
 
-- 
2.51.0