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Date:   Tue, 28 Nov 2017 21:06:06 -0800
From:   Eric Biggers <>
To:     Andrew Morton <>
Cc:     syzbot 
        "Paul E. McKenney" <>,
        Herbert Xu <>
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.


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