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| author | Arnd Bergmann <arnd@arndb.de> | 2024-04-04 09:35:59 +0300 |
|---|---|---|
| committer | Kalle Valo <quic_kvalo@quicinc.com> | 2024-04-04 13:09:45 +0300 |
| commit | 61752ac69b69ed2e04444d090f6917c77ab36d42 (patch) | |
| tree | 2ab6f48068c98a62efcebac950110e3148a7e38c | |
| parent | 066afafc10c9476ee36c47c9062527a17e763901 (diff) | |
| download | linux-61752ac69b69ed2e04444d090f6917c77ab36d42.tar.xz | |
wifi: ath9k: work around memset overflow warning
gcc-9 and some other older versions produce a false-positive warning
for zeroing two fields
In file included from include/linux/string.h:369,
from drivers/net/wireless/ath/ath9k/main.c:18:
In function 'fortify_memset_chk',
inlined from 'ath9k_ps_wakeup' at drivers/net/wireless/ath/ath9k/main.c:140:3:
include/linux/fortify-string.h:462:25: error: call to '__write_overflow_field' declared with attribute warning: detected write beyond size of field (1st parameter); maybe use struct_group()? [-Werror=attribute-warning]
462 | __write_overflow_field(p_size_field, size);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Using a struct_group seems to reliably avoid the warning and
not make the code much uglier. The combined memset() should even
save a couple of cpu cycles.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Toke Høiland-Jørgensen <toke@toke.dk>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://msgid.link/20240328135509.3755090-3-arnd@kernel.org
| -rw-r--r-- | drivers/net/wireless/ath/ath.h | 6 | ||||
| -rw-r--r-- | drivers/net/wireless/ath/ath9k/main.c | 3 |
2 files changed, 5 insertions, 4 deletions
diff --git a/drivers/net/wireless/ath/ath.h b/drivers/net/wireless/ath/ath.h index f02a308a9ffc..34654f710d8a 100644 --- a/drivers/net/wireless/ath/ath.h +++ b/drivers/net/wireless/ath/ath.h @@ -171,8 +171,10 @@ struct ath_common { unsigned int clockrate; spinlock_t cc_lock; - struct ath_cycle_counters cc_ani; - struct ath_cycle_counters cc_survey; + struct_group(cc, + struct ath_cycle_counters cc_ani; + struct ath_cycle_counters cc_survey; + ); struct ath_regulatory regulatory; struct ath_regulatory reg_world_copy; diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c index a2943aaecb20..01173aac3045 100644 --- a/drivers/net/wireless/ath/ath9k/main.c +++ b/drivers/net/wireless/ath/ath9k/main.c @@ -135,8 +135,7 @@ void ath9k_ps_wakeup(struct ath_softc *sc) if (power_mode != ATH9K_PM_AWAKE) { spin_lock(&common->cc_lock); ath_hw_cycle_counters_update(common); - memset(&common->cc_survey, 0, sizeof(common->cc_survey)); - memset(&common->cc_ani, 0, sizeof(common->cc_ani)); + memset(&common->cc, 0, sizeof(common->cc)); spin_unlock(&common->cc_lock); } |