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Date: Sun, 6 Jun 2021 23:40:24 +0800
From: butt3rflyh4ck <>
Subject: Re: Linux kernel: nfc: null ptr dereference in llcp_sock_getname

Hi, the patch for this issue in upstream:


On Tue, Jun 1, 2021 at 3:37 PM butt3rflyh4ck <> wrote:
>  Hi, there was a null pointer dereference in llcp_sock_getname in
> net/nfc/llcp_sock.c and reproduced it in linux-5.13.0-rc2. An
> unprivileged user can trigger this bug and cause denial of service.
> #Root Cause
> After creating an nfc socket, bind the address by calling bind(), if
> LLCP_SAP_MAX was used as SAP, it cause the bind() failed and there
> would set llcp_sock->service_name  as NULL.
> Although bind() returns an error here, it does not affect calling
> other socket functions. sock_getname() would invoke
> llcp_sock_getname(), llcp_sock_getname copied service  name from
> llcp_sock->service_name by memcpy but llcp_sock->service_name is NULL.
> #Fix
> the patch for this issue:
> #CVE
> CVE not assigned.
> #Credits
> Active Defense Lab of Venustech.
> Regards,
>    butt3rflyh4ck.
> --
> Active Defense Lab of Venustech

Active Defense Lab of Venustech

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