Subject: Re: [PATCH 04/11] ath11: Wstringop-overread warning

From: Kalle Valo <[email-masked]>
Date: Tue, 28 Sep 2021 09:04:02 +0000 (UTC)

Arnd Bergmann <[email-masked]> wrote:

> gcc-11 with the kernel address sanitizer prints a warning for this
> driver:
> 
> In function 'ath11k_peer_assoc_h_vht',
>     inlined from 'ath11k_peer_assoc_prepare' at drivers/net/wireless/ath/ath11k/mac.c:1632:2:
> drivers/net/wireless/ath/ath11k/mac.c:1164:13: error: 'ath11k_peer_assoc_h_vht_masked' reading 16 bytes from a region of size 4 [-Werror=stringop-overread]
>  1164 |         if (ath11k_peer_assoc_h_vht_masked(vht_mcs_mask))
>       |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> drivers/net/wireless/ath/ath11k/mac.c: In function 'ath11k_peer_assoc_prepare':
> drivers/net/wireless/ath/ath11k/mac.c:1164:13: note: referencing argument 1 of type 'const u16 *' {aka 'const short unsigned int *'}
> drivers/net/wireless/ath/ath11k/mac.c:969:1: note: in a call to function 'ath11k_peer_assoc_h_vht_masked'
>   969 | ath11k_peer_assoc_h_vht_masked(const u16 vht_mcs_mask[NL80211_VHT_NSS_MAX])
>       | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> According to analysis from gcc developers, this is a glitch in the
> way gcc tracks the size of struct members. This should really get
> fixed in gcc, but it's also easy to work around this instance
> by changing the function prototype to no include the length of
> the array.
> 
> Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99673
> Signed-off-by: Arnd Bergmann <[email-masked]>
> Signed-off-by: Kalle Valo <[email-masked]>

Patch applied to ath-next branch of ath.git, thanks.

eb19efed836a ath11k: Wstringop-overread warning

-- 
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