linux-kernel - [PATCH] btrfs: fix memory leak in data_reloc_print_warning

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Message-Id: <20251105023722.1820102-1-zilin@seu.edu.cn>
Date: Wed,  5 Nov 2025 02:37:22 +0000
From: Zilin Guan <zilin@....edu.cn>
To: clm@...com
Cc: dsterba@...e.com,
	linux-btrfs@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	jianhao.xu@....edu.cn,
	Zilin Guan <zilin@....edu.cn>
Subject: [PATCH] btrfs: fix memory leak in data_reloc_print_warning_inode()

data_reloc_print_warning_inode() calls btrfs_get_fs_root() to obtain
local_root, but fails to release its reference when paths_from_inode()
returns an error. This causes a potential memory leak.

Add a missing btrfs_put_root() call in the error path to properly
decrease the reference count of local_root.

Fixes: b9a9a85059cde ("btrfs: output affected files when relocation fails")
Signed-off-by: Zilin Guan <zilin@....edu.cn>
---
 fs/btrfs/inode.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 3df5f36185a0..6282911e536f 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -177,8 +177,10 @@ static int data_reloc_print_warning_inode(u64 inum, u64 offset, u64 num_bytes,
 		return ret;
 	}
 	ret = paths_from_inode(inum, ipath);
-	if (ret < 0)
+	if (ret < 0) {
+		btrfs_put_root(local_root);
 		goto err;
+	}
 
 	/*
 	 * We deliberately ignore the bit ipath might have been too small to
-- 
2.34.1