linux-kernel - Re: [syzbot] [btrfs?] kernel BUG in btrfs_qgroup

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Message-ID: <tencent_B5B404449776B76666D7B36B03644962A305@qq.com>
Date: Mon,  8 Dec 2025 18:50:16 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+b44d4a4885bc82af2a06@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [btrfs?] kernel BUG in btrfs_qgroup_inherit

#syz test

diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c
index 9e2b53e90dcb..ac5380520152 100644
--- a/fs/btrfs/qgroup.c
+++ b/fs/btrfs/qgroup.c
@@ -3289,10 +3289,6 @@ int btrfs_qgroup_inherit(struct btrfs_trans_handle *trans, u64 srcid,
 	if (!btrfs_qgroup_enabled(fs_info))
 		return 0;
 
-	prealloc = kzalloc(sizeof(*prealloc), GFP_NOFS);
-	if (!prealloc)
-		return -ENOMEM;
-
 	/*
 	 * There are only two callers of this function.
 	 *
@@ -3388,6 +3384,12 @@ int btrfs_qgroup_inherit(struct btrfs_trans_handle *trans, u64 srcid,
 		}
 	}
 
+	prealloc = kzalloc(sizeof(*prealloc), GFP_NOFS);
+	if (!prealloc) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
 	spin_lock(&fs_info->qgroup_lock);
 
 	dstgroup = add_qgroup_rb(fs_info, prealloc, objectid);