From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-f200.google.com (mail-pf0-f200.google.com [209.85.192.200]) by kanga.kvack.org (Postfix) with ESMTP id 9B9E16B0253 for ; Wed, 29 Nov 2017 00:06:10 -0500 (EST) Received: by mail-pf0-f200.google.com with SMTP id j3so1578278pfh.16 for ; Tue, 28 Nov 2017 21:06:10 -0800 (PST) Received: from mail-sor-f41.google.com (mail-sor-f41.google.com. [209.85.220.41]) by mx.google.com with SMTPS id c184sor270276pfc.35.2017.11.28.21.06.09 for (Google Transport Security); Tue, 28 Nov 2017 21:06:09 -0800 (PST) Date: Tue, 28 Nov 2017 21:06:06 -0800 From: Eric Biggers 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> Sender: owner-linux-mm@kvack.org List-ID: 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 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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org