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From:   Ben Hutchings <ben@decadent.org.uk>
To:     linux-kernel@vger.kernel.org, stable@vger.kernel.org
CC:     akpm@linux-foundation.org,
        "Tetsuo Handa" <penguin-kernel@I-love.SAKURA.ne.jp>,
        "Miklos Szeredi" <mszeredi@redhat.com>,
        "syzbot" <syzbot+ec3986119086fe4eec97@syzkaller.appspotmail.com>,
        "Anand Avati" <avati@redhat.com>, "Csaba Henk" <csaba@gluster.com>,
        "John Muir" <john@jmuir.com>
Date:   Sun, 11 Nov 2018 19:49:05 +0000
Message-ID: <lsq.1541965745.919103908@decadent.org.uk>
Subject: [PATCH 3.16 101/366] fuse: don't keep dead fuse_conn at
 fuse_fill_super().
In-Reply-To: <lsq.1541965744.387173642@decadent.org.uk>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

3.16.61-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>

commit 543b8f8662fe6d21f19958b666ab0051af9db21a upstream.

syzbot is reporting use-after-free at fuse_kill_sb_blk() [1].
Since sb->s_fs_info field is not cleared after fc was released by
fuse_conn_put() when initialization failed, fuse_kill_sb_blk() finds
already released fc and tries to hold the lock. Fix this by clearing
sb->s_fs_info field after calling fuse_conn_put().

[1] https://syzkaller.appspot.com/bug?id=a07a680ed0a9290585ca424546860464dd9658db

Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Reported-by: syzbot <syzbot+ec3986119086fe4eec97@syzkaller.appspotmail.com>
Fixes: 3b463ae0c626 ("fuse: invalidation reverse calls")
Cc: John Muir <john@jmuir.com>
Cc: Csaba Henk <csaba@gluster.com>
Cc: Anand Avati <avati@redhat.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
 fs/fuse/inode.c | 1 +
 1 file changed, 1 insertion(+)

--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -1125,6 +1125,7 @@ static int fuse_fill_super(struct super_
  err_put_conn:
 	fuse_bdi_destroy(fc);
 	fuse_conn_put(fc);
+	sb->s_fs_info = NULL;
  err_fput:
 	fput(file);
  err: