linux-kernel - Re: [PATCH v2] net: mac802154: Fix general protection fault

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Date:   Mon, 05 Apr 2021 08:45:18 +0300
From:   Pavel Skripkin <paskripkin@...il.com>
To:     Alexander Aring <alex.aring@...il.com>
Cc:     Stefan Schmidt <stefan@...enfreihafen.org>,
        "David S. Miller" <davem@...emloft.net>,
        linux-wpan - ML <linux-wpan@...r.kernel.org>,
        "open list:NETWORKING [GENERAL]" <netdev@...r.kernel.org>,
        kernel list <linux-kernel@...r.kernel.org>,
        syzbot+9ec037722d2603a9f52e@...kaller.appspotmail.com
Subject: Re: [PATCH v2] net: mac802154: Fix general protection fault

Hi!

On Sun, 2021-04-04 at 20:43 -0400, Alexander Aring wrote:
> Hi,
> 
> On Thu, 4 Mar 2021 at 10:25, Pavel Skripkin <paskripkin@...il.com>
> wrote:
> > 
> > syzbot found general protection fault in crypto_destroy_tfm()[1].
> > It was caused by wrong clean up loop in llsec_key_alloc().
> > If one of the tfm array members is in IS_ERR() range it will
> > cause general protection fault in clean up function [1].
> > 
> > Call Trace:
> >  crypto_free_aead include/crypto/aead.h:191 [inline] [1]
> >  llsec_key_alloc net/mac802154/llsec.c:156 [inline]
> >  mac802154_llsec_key_add+0x9e0/0xcc0 net/mac802154/llsec.c:249
> >  ieee802154_add_llsec_key+0x56/0x80 net/mac802154/cfg.c:338
> >  rdev_add_llsec_key net/ieee802154/rdev-ops.h:260 [inline]
> >  nl802154_add_llsec_key+0x3d3/0x560 net/ieee802154/nl802154.c:1584
> >  genl_family_rcv_msg_doit+0x228/0x320 net/netlink/genetlink.c:739
> >  genl_family_rcv_msg net/netlink/genetlink.c:783 [inline]
> >  genl_rcv_msg+0x328/0x580 net/netlink/genetlink.c:800
> >  netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2502
> >  genl_rcv+0x24/0x40 net/netlink/genetlink.c:811
> >  netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline]
> >  netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1338
> >  netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1927
> >  sock_sendmsg_nosec net/socket.c:654 [inline]
> >  sock_sendmsg+0xcf/0x120 net/socket.c:674
> >  ____sys_sendmsg+0x6e8/0x810 net/socket.c:2350
> >  ___sys_sendmsg+0xf3/0x170 net/socket.c:2404
> >  __sys_sendmsg+0xe5/0x1b0 net/socket.c:2433
> >  do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
> >  entry_SYSCALL_64_after_hwframe+0x44/0xae
> > 
> > Signed-off-by: Pavel Skripkin <paskripkin@...il.com>
> > Reported-by: syzbot+9ec037722d2603a9f52e@...kaller.appspotmail.com
> > Change-Id: I29f7ac641a039096d63d1e6070bb32cb5a3beb07
> 
> I am sorry, I don't know the tag "Change-Id", I was doing a whole
> grep
> on Documentation/ without any luck.
> 

I forgot to check the patch with ./scripts/checkpatch.pl :(

> Dumb question: What is the meaning of it?

This is for gerrit code review. This is required to push changes to
gerrit public mirror. I'm using it to check patches with syzbot. Change
ids are useless outside gerrit, so it shouldn't be here.

Btw, should I sent v2 or this is already fixed? 

> 
> - Alex

With regards,
Pavel Skripkin