linux-kernel - Re: WARNING: suspicious RCU usage (3)

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Message-ID: <20171129050606.GF24001@zzz.localdomain>
Date:   Tue, 28 Nov 2017 21:06:06 -0800
From:   Eric Biggers <ebiggers3@...il.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     syzbot 
        <bot+73a7bec1bc0f4fc0512a246334081f8c671762a8@...kaller.appspotmail.com>,
        cl@...ux.com, iamjoonsoo.kim@....com, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, penberg@...nel.org, rientjes@...gle.com,
        syzkaller-bugs@...glegroups.com,
        "Paul E. McKenney" <paulmck@...ibm.com>,
        Herbert Xu <herbert@...dor.apana.org.au>
Subject: Re: WARNING: suspicious RCU usage (3)

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