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Date: Wed, 5 May 2021 07:50:12 +0300
From: Leon Romanovsky <leon@...nel.org>
To: "David S. Miller" <davem@...emloft.net>
Cc: Or Cohen <orcohen@...oaltonetworks.com>, netdev@...r.kernel.org,
davem@...emloft.net, kuba@...nel.org, nixiaoming@...wei.com,
matthieu.baerts@...sares.net, mkl@...gutronix.de,
nmarkus@...oaltonetworks.com
Subject: Re: [PATCH] net/nfc: fix use-after-free llcp_sock_bind/connect
On Tue, May 04, 2021 at 07:10:10PM +0000, patchwork-bot+netdevbpf@...nel.org wrote:
> Hello:
>
> This patch was applied to netdev/net.git (refs/heads/master):
>
> On Tue, 4 May 2021 10:16:46 +0300 you wrote:
> > Commits 8a4cd82d ("nfc: fix refcount leak in llcp_sock_connect()")
> > and c33b1cc62 ("nfc: fix refcount leak in llcp_sock_bind()")
> > fixed a refcount leak bug in bind/connect but introduced a
> > use-after-free if the same local is assigned to 2 different sockets.
> >
> > This can be triggered by the following simple program:
> > int sock1 = socket( AF_NFC, SOCK_STREAM, NFC_SOCKPROTO_LLCP );
> > int sock2 = socket( AF_NFC, SOCK_STREAM, NFC_SOCKPROTO_LLCP );
> > memset( &addr, 0, sizeof(struct sockaddr_nfc_llcp) );
> > addr.sa_family = AF_NFC;
> > addr.nfc_protocol = NFC_PROTO_NFC_DEP;
> > bind( sock1, (struct sockaddr*) &addr, sizeof(struct sockaddr_nfc_llcp) )
> > bind( sock2, (struct sockaddr*) &addr, sizeof(struct sockaddr_nfc_llcp) )
> > close(sock1);
> > close(sock2);
> >
> > [...]
>
> Here is the summary with links:
> - net/nfc: fix use-after-free llcp_sock_bind/connect
> https://git.kernel.org/netdev/net/c/c61760e6940d
Dave,
Can you please share your thoughts how this patch can be correct?
https://lore.kernel.org/netdev/YJIjN6MTRdQ7Bvcp@unreal/T/#m1e67ae6c2658312a134f65819c5ad92511f207c1
It is also under review, so unclear why it was merged.
Thanks
>
> You are awesome, thank you!
> --
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