linux-kernel - Re: [PATCH] wifi: ath12k: fix one more memcpy size error

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Message-ID: <875xq45fdn.fsf@kernel.org>
Date: Mon, 07 Oct 2024 14:20:04 +0300
From: Kalle Valo <kvalo@...nel.org>
To: Arnd Bergmann <arnd@...nel.org>
Cc: Jeff Johnson <jjohnson@...nel.org>,  Jakub Kicinski <kuba@...nel.org>,
  Kees Cook <kees@...nel.org>,  Paolo Abeni <pabeni@...hat.com>,  Baochen
 Qiang <quic_bqiang@...cinc.com>,  Arnd Bergmann <arnd@...db.de>,
  Rameshkumar Sundaram <quic_ramess@...cinc.com>,
  linux-wireless@...r.kernel.org,  ath12k@...ts.infradead.org,
  linux-kernel@...r.kernel.org
Subject: Re: [PATCH] wifi: ath12k: fix one more memcpy size error

Arnd Bergmann <arnd@...nel.org> writes:

> From: Arnd Bergmann <arnd@...db.de>
>
> A previous patch addressed a fortified-memcpy warning on older compilers,
> but there is still a warning on gcc-14 in some configurations:
>
> In file included from include/linux/string.h:390,
>                  from drivers/net/wireless/ath/ath12k/wow.c:7:
> drivers/net/wireless/ath/ath12k/wow.c: In function 'ath12k_wow_convert_8023_to_80211.isra':
> include/linux/fortify-string.h:114:33: error: '__builtin_memcpy' accessing 18446744073709551610 or more bytes at offsets 0 and 0 overlaps 9223372036854775797 bytes at offset -9223372036854775803 [-Werror=restrict]
> include/linux/fortify-string.h:679:26: note: in expansion of macro '__fortify_memcpy_chk'
>   679 | #define memcpy(p, q, s)  __fortify_memcpy_chk(p, q, s,                  \
>       |                          ^~~~~~~~~~~~~~~~~~~~
> drivers/net/wireless/ath/ath12k/wow.c:199:25: note: in expansion of macro 'memcpy'
>   199 |                         memcpy(pat + a3_ofs - pkt_ofs,
>       |                         ^~~~~~
>
> Address this the same way as the other two, using size_add().
>
> Fixes: b49991d83bba ("wifi: ath12k: fix build vs old compiler")
> Fixes: 4a3c212eee0e ("wifi: ath12k: add basic WoW functionalities")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Acked-by: Kalle Valo <kvalo@...nel.org>

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