netdev - Re: [PATCH net] wifi: ath12k: fix build vs old compiler

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Message-ID: <a7950e7b-2275-4b6d-b8e1-4f50d0bc28e6@quicinc.com>
Date: Tue, 16 Jul 2024 07:00:44 -0700
From: Jeff Johnson <quic_jjohnson@...cinc.com>
To: Paolo Abeni <pabeni@...hat.com>, <netdev@...r.kernel.org>
CC: Kalle Valo <kvalo@...nel.org>, Jeff Johnson <jjohnson@...nel.org>,
        "Baochen Qiang" <quic_bqiang@...cinc.com>,
        <linux-wireless@...r.kernel.org>, <ath12k@...ts.infradead.org>,
        Jakub Kicinski <kuba@...nel.org>,
        "David S.
 Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH net] wifi: ath12k: fix build vs old compiler

On 7/16/2024 4:06 AM, Paolo Abeni wrote:
> gcc 11.4.1-3 warns about memcpy() with overlapping pointers:
> 
> drivers/net/wireless/ath/ath12k/wow.c: In function ‘ath12k_wow_convert_8023_to_80211.constprop’:
> ./include/linux/fortify-string.h:114:33: error: ‘__builtin_memcpy’ accessing 18446744073709551611 or more bytes at offsets 0 and 0 overlaps 9223372036854775799 bytes at offset -9223372036854775804 [-Werror=restrict]
>   114 | #define __underlying_memcpy     __builtin_memcpy
>       |                                 ^
> ./include/linux/fortify-string.h:637:9: note: in expansion of macro ‘__underlying_memcpy’
>   637 |         __underlying_##op(p, q, __fortify_size);                        \
>       |         ^~~~~~~~~~~~~
> ./include/linux/fortify-string.h:682:26: note: in expansion of macro ‘__fortify_memcpy_chk’
>   682 | #define memcpy(p, q, s)  __fortify_memcpy_chk(p, q, s,                  \
>       |                          ^~~~~~~~~~~~~~~~~~~~
> drivers/net/wireless/ath/ath12k/wow.c:190:25: note: in expansion of macro ‘memcpy’
>   190 |                         memcpy(pat, eth_pat, eth_pat_len);
>       |                         ^~~~~~
> ./include/linux/fortify-string.h:114:33: error: ‘__builtin_memcpy’ accessing 18446744073709551605 or more bytes at offsets 0 and 0 overlaps 9223372036854775787 bytes at offset -9223372036854775798 [-Werror=restrict]
>   114 | #define __underlying_memcpy     __builtin_memcpy
>       |                                 ^
> ./include/linux/fortify-string.h:637:9: note: in expansion of macro ‘__underlying_memcpy’
>   637 |         __underlying_##op(p, q, __fortify_size);                        \
>       |         ^~~~~~~~~~~~~
> ./include/linux/fortify-string.h:682:26: note: in expansion of macro ‘__fortify_memcpy_chk’
>   682 | #define memcpy(p, q, s)  __fortify_memcpy_chk(p, q, s,                  \
>       |                          ^~~~~~~~~~~~~~~~~~~~
> drivers/net/wireless/ath/ath12k/wow.c:232:25: note: in expansion of macro ‘memcpy’
>   232 |                         memcpy(pat, eth_pat, eth_pat_len);
>       |                         ^~~~~~
> 
> The sum of size_t operands can overflow SIZE_MAX, triggering the
> warning.
> Address the issue using the suitable helper.
> 
> Fixes: 4a3c212eee0e ("wifi: ath12k: add basic WoW functionalities")
> Signed-off-by: Paolo Abeni <pabeni@...hat.com>
> ---
> Only built tested. Sending directly to net to reduce the RTT, but no
> objections to go through the WiFi tree first
> ---
>  drivers/net/wireless/ath/ath12k/wow.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/wireless/ath/ath12k/wow.c b/drivers/net/wireless/ath/ath12k/wow.c
> index c5cba825a84a..bead19db2c9a 100644
> --- a/drivers/net/wireless/ath/ath12k/wow.c
> +++ b/drivers/net/wireless/ath/ath12k/wow.c
> @@ -186,7 +186,7 @@ ath12k_wow_convert_8023_to_80211(struct ath12k *ar,
>  	if (eth_pkt_ofs < ETH_ALEN) {
>  		pkt_ofs = eth_pkt_ofs + a1_ofs;
>  
> -		if (eth_pkt_ofs + eth_pat_len < ETH_ALEN) {
> +		if (size_add(eth_pkt_ofs, eth_pat_len) < ETH_ALEN) {
>  			memcpy(pat, eth_pat, eth_pat_len);
>  			memcpy(bytemask, eth_bytemask, eth_pat_len);
>  
> @@ -228,7 +228,7 @@ ath12k_wow_convert_8023_to_80211(struct ath12k *ar,
>  	} else if (eth_pkt_ofs < prot_ofs) {
>  		pkt_ofs = eth_pkt_ofs - ETH_ALEN + a3_ofs;
>  
> -		if (eth_pkt_ofs + eth_pat_len < prot_ofs) {
> +		if (size_add(eth_pkt_ofs, eth_pat_len) < prot_ofs) {
>  			memcpy(pat, eth_pat, eth_pat_len);
>  			memcpy(bytemask, eth_bytemask, eth_pat_len);
>  

Duplicate of https://msgid.link/20240704144341.207317-1-kvalo@kernel.org ??