linux-kernel - [PATCH 5.4 109/151] btrfs: ref-verify: fix memory leak in btrfs_ref_tree

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Message-Id: <20201117122126.731224802@linuxfoundation.org>
Date:   Tue, 17 Nov 2020 14:05:39 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Josef Bacik <josef@...icpanda.com>,
        Dinghao Liu <dinghao.liu@....edu.cn>,
        David Sterba <dsterba@...e.com>
Subject: [PATCH 5.4 109/151] btrfs: ref-verify: fix memory leak in btrfs_ref_tree_mod

From: Dinghao Liu <dinghao.liu@....edu.cn>

commit 468600c6ec28613b756193c5f780aac062f1acdf upstream.

There is one error handling path that does not free ref, which may cause
a minor memory leak.

CC: stable@...r.kernel.org # 4.19+
Reviewed-by: Josef Bacik <josef@...icpanda.com>
Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>
Reviewed-by: David Sterba <dsterba@...e.com>
Signed-off-by: David Sterba <dsterba@...e.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/btrfs/ref-verify.c |    1 +
 1 file changed, 1 insertion(+)

--- a/fs/btrfs/ref-verify.c
+++ b/fs/btrfs/ref-verify.c
@@ -851,6 +851,7 @@ int btrfs_ref_tree_mod(struct btrfs_fs_i
 "dropping a ref for a root that doesn't have a ref on the block");
 			dump_block_entry(fs_info, be);
 			dump_ref_action(fs_info, ra);
+			kfree(ref);
 			kfree(ra);
 			goto out_unlock;
 		}