linux-kernel - Re: KASAN: use-after-free Read in __list_add

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Date:   Tue, 15 May 2018 13:49:23 -0700
From:   Roland Dreier <roland@...estorage.com>
To:     Eric Biggers <ebiggers3@...il.com>
Cc:     linux-rdma@...r.kernel.org, Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...pe.ca>, rds-devel@....oracle.com,
        syzbot <syzbot+db1c219466daac1083df@...kaller.appspotmail.com>,
        LKML <linux-kernel@...r.kernel.org>,
        syzkaller-bugs@...glegroups.com
Subject: Re: KASAN: use-after-free Read in __list_add_valid (5)

> Still reproducible on Linus' tree (commit 66e1c94db3cd4e) and on linux-next
> (next-20180511).  Here's a simplified reproducer:

Thanks!  That's a fantastic test case.

The issue is a race where rdma_listen() sees invalid state in the
middle of an rdma_bind_addr() call that will ultimately fail.  I'll
send a proposed patch shortly.

 - R.