From: Pavel Skripkin <paskripkin@gmail.com>
To: Alexander Aring <alex.aring@gmail.com>
Cc: Stefan Schmidt <stefan@datenfreihafen.org>,
"David S. Miller" <davem@davemloft.net>,
linux-wpan - ML <linux-wpan@vger.kernel.org>,
"open list:NETWORKING [GENERAL]" <netdev@vger.kernel.org>,
kernel list <linux-kernel@vger.kernel.org>,
syzbot+12cf5fbfdeba210a89dd@syzkaller.appspotmail.com
Subject: Re: [PATCH] net: mac802154: Fix null pointer dereference
Date: Thu, 04 Mar 2021 12:23:22 +0300 [thread overview]
Message-ID: <e70d7b45638db427be978c620475a330cb9db57c.camel@gmail.com> (raw)
In-Reply-To: <CAB_54W6-ONBmLhaQqrDD=efiinRosxe06VEGDqmMM-1-XjYcPw@mail.gmail.com>
Hi, thanks for your reply!
On Wed, 2021-03-03 at 21:40 -0500, Alexander Aring wrote:
> Hi,
>
> On Wed, 3 Mar 2021 at 11:28, Pavel Skripkin <paskripkin@gmail.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 won't be initialized it will cause
> > NULL dereference in crypto_destroy_tfm().
> >
> > 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@gmail.com>
> > Reported-by: syzbot+12cf5fbfdeba210a89dd@syzkaller.appspotmail.com
> > ---
> > net/mac802154/llsec.c | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/net/mac802154/llsec.c b/net/mac802154/llsec.c
> > index 585d33144c33..6709f186f777 100644
> > --- a/net/mac802154/llsec.c
> > +++ b/net/mac802154/llsec.c
> > @@ -151,7 +151,7 @@ llsec_key_alloc(const struct
> > ieee802154_llsec_key *template)
> > err_tfm0:
> > crypto_free_sync_skcipher(key->tfm0);
> > err_tfm:
> > - for (i = 0; i < ARRAY_SIZE(key->tfm); i++)
> > + for (; i >= 0; i--)
> > if (key->tfm[i])
>
> I think this need to be:
>
> if (!IS_ERR_OR_NULL(key->tfm[i]))
>
> otherwise we still run into issues for the current iterator when
> key->tfm[i] is in range of IS_ERR().
Oh... I got it completly wrong, I'm sorry. If it's still not fixed,
I'll send rigth patch for that.
>
> - Alex
--
With regards,
Pavel Skripkin
next prev parent reply other threads:[~2021-03-04 9:25 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-03 16:27 [PATCH] net: mac802154: Fix null pointer dereference Pavel Skripkin
2021-03-04 2:40 ` Alexander Aring
2021-03-04 9:23 ` Pavel Skripkin [this message]
2021-03-04 14:22 ` Alexander Aring
2021-03-04 15:21 ` [PATCH v2] net: mac802154: Fix general protection fault Pavel Skripkin
2021-03-08 8:27 ` Stefan Schmidt
2021-04-05 0:43 ` Alexander Aring
2021-04-05 5:45 ` Pavel Skripkin
2021-04-05 11:50 ` Alexander Aring
2021-04-06 20:43 ` Stefan Schmidt
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=e70d7b45638db427be978c620475a330cb9db57c.camel@gmail.com \
--to=paskripkin@gmail.com \
--cc=alex.aring@gmail.com \
--cc=davem@davemloft.net \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-wpan@vger.kernel.org \
--cc=netdev@vger.kernel.org \
--cc=stefan@datenfreihafen.org \
--cc=syzbot+12cf5fbfdeba210a89dd@syzkaller.appspotmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).