From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751456AbdK2FGL (ORCPT ); Wed, 29 Nov 2017 00:06:11 -0500 Received: from mail-pf0-f174.google.com ([209.85.192.174]:42305 "EHLO mail-pf0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751069AbdK2FGJ (ORCPT ); Wed, 29 Nov 2017 00:06:09 -0500 X-Google-Smtp-Source: AGs4zMYmDmoESdDF1r6KK+UYjj6hSmQCDFfSKU7HIP3wRYKcnhRkBRriv4IraxiKlkVhWG9GzhFoDQ== Date: Tue, 28 Nov 2017 21:06:06 -0800 From: Eric Biggers To: Andrew Morton Cc: syzbot , cl@linux.com, iamjoonsoo.kim@lge.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, penberg@kernel.org, rientjes@google.com, syzkaller-bugs@googlegroups.com, "Paul E. McKenney" , Herbert Xu Subject: Re: WARNING: suspicious RCU usage (3) Message-ID: <20171129050606.GF24001@zzz.localdomain> References: <94eb2c03c9bcc3b127055f11171d@google.com> <20171128133026.cf03471c99d7a0c827c5a21c@linux-foundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20171128133026.cf03471c99d7a0c827c5a21c@linux-foundation.org> User-Agent: Mutt/1.9.1 (2017-09-22) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Nov 28, 2017 at 01:30:26PM -0800, Andrew Morton wrote: > > It looks like blkcipher_walk_done() passed a bad address to kfree(). > Indeed, it's freeing uninitialized memory because the Salsa20 algorithms are using the blkcipher_walk API incorrectly. I've sent a patch to fix it: "crypto: salsa20 - fix blkcipher_walk API usage" I am not sure why the bug reports show up as "suspicious RCU usage", though. There were also a few other syzbot reports of this same underlying bug; I marked them as duplicates of this one. Eric