netdev - Re: [PATCH net v2] nfc: pn533: Clear nfc

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Date:   Tue, 13 Dec 2022 15:41:36 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Minsuk Kang <linuxlovemin@...sei.ac.kr>, netdev@...r.kernel.org
Cc:     linma@....edu.cn, davem@...emloft.net, sameo@...ux.intel.com,
        linville@...driver.com, dokyungs@...sei.ac.kr,
        jisoo.jang@...sei.ac.kr
Subject: Re: [PATCH net v2] nfc: pn533: Clear nfc_target before being used

On 13/12/2022 15:38, Krzysztof Kozlowski wrote:
> On 13/12/2022 15:27, Minsuk Kang wrote:
>> Fix a slab-out-of-bounds read that occurs in nla_put() called from
>> nfc_genl_send_target() when target->sensb_res_len, which is duplicated
>> from an nfc_target in pn533, is too large as the nfc_target is not
>> properly initialized and retains garbage values. Clear nfc_targets with
>> memset() before they are used.
>>
>> Found by a modified version of syzkaller.
>>
>> BUG: KASAN: slab-out-of-bounds in nla_put
>> Call Trace:
>>  memcpy
>>  nla_put
>>  nfc_genl_dump_targets
>>  genl_lock_dumpit
>>  netlink_dump
>>  __netlink_dump_start
>>  genl_family_rcv_msg_dumpit
>>  genl_rcv_msg
>>  netlink_rcv_skb
>>  genl_rcv
>>  netlink_unicast
>>  netlink_sendmsg
>>  sock_sendmsg
>>  ____sys_sendmsg
>>  ___sys_sendmsg
>>  __sys_sendmsg
>>  do_syscall_64
>>
>> Fixes: 673088fb42d0 ("NFC: pn533: Send ATR_REQ directly for active device detection")
>> Fixes: 361f3cb7f9cf ("NFC: DEP link hook implementation for pn533")
>> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> 
> How did it happen? From where did you get it?

I double checked - I did not send it. This is some fake tag. Please do
not add fake/invented/created tags with people's names.

Best regards,
Krzysztof