Received-SPF: pass (google.com: domain of linux-ext4-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
From:   Jun Nie <jun.nie@linaro.org>
To:     tytso@mit.edu, adilger.kernel@dilger.ca,
        linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org
Cc:     tudor.ambarus@linaro.org
Subject: [PATCH v2 2/2] ext4: refuse to create ea block when umounted
Date:   Tue,  3 Jan 2023 09:45:17 +0800
Message-Id: <20230103014517.495275-3-jun.nie@linaro.org>
In-Reply-To: <20230103014517.495275-1-jun.nie@linaro.org>
References: <20230103014517.495275-1-jun.nie@linaro.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

The ea block expansion need to access s_root while it is
already set as NULL when umount is triggered. Refuse this
request to avoid panic.

Reported-by: syzbot+2dacb8f015bf1420155f@syzkaller.appspotmail.com
Link: https://syzkaller.appspot.com/bug?id=3613786cb88c93aa1c6a279b1df6a7b201347d08
Signed-off-by: Jun Nie <jun.nie@linaro.org>
---
 fs/ext4/xattr.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
index 235a517d9c17..b350510b798c 100644
--- a/fs/ext4/xattr.c
+++ b/fs/ext4/xattr.c
@@ -1422,6 +1422,13 @@ static struct inode *ext4_xattr_inode_create(handle_t *handle,
 	uid_t owner[2] = { i_uid_read(inode), i_gid_read(inode) };
 	int err;
 
+	if (inode->i_sb->s_root == NULL) {
+		ext4_warning(inode->i_sb,
+			     "refuse to create EA inode when umounting");
+		WARN_ON(1);
+		return ERR_PTR(-EINVAL);
+	}
+
 	/*
 	 * Let the next inode be the goal, so we try and allocate the EA inode
 	 * in the same group, or nearby one.
-- 
2.34.1