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

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Date:   Thu, 30 Nov 2017 00:59:44 -0800
From:   Eric Biggers <ebiggers3@...il.com>
To:     syzbot 
        <bot+63a09d8c7627bb7c054d94ba904d8d2d3687d64a@...kaller.appspotmail.com>
Cc:     davem@...emloft.net, herbert@...dor.apana.org.au,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: KASAN: use-after-free Read in blkcipher_walk_virt

On Thu, Nov 30, 2017 at 12:37:01AM -0800, syzbot wrote:
> ==================================================================
> BUG: KASAN: use-after-free in crypto_tfm_alg_blocksize
> include/linux/crypto.h:671 [inline]
> BUG: KASAN: use-after-free in crypto_blkcipher_blocksize
> include/linux/crypto.h:1214 [inline]
> BUG: KASAN: use-after-free in blkcipher_walk_virt+0x286/0x2a0
> crypto/blkcipher.c:304
> Read of size 8 at addr ffff8801ccba7f38 by task syz-executor5/4473
> 

#syz dup: KASAN: use-after-free Read in aead_recvmsg