Messages in this thread | | | From | Kalle Valo <> | Subject | Re: [PATCH] ath9k: Fix possible data races in ath_set_channel() | Date | Mon, 13 Jan 2020 09:17:28 +0200 |
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Jia-Ju Bai <baijiaju1990@gmail.com> writes:
> The functions ath9k_config() and ath_ani_calibrate() may be concurrently > executed. > > A variable survey->filled is accessed with holding a spinlock > common->cc_lock, through: > ath_ani_calibrate() > spin_lock_irqsave(&common->cc_lock, flags); > ath_update_survey_stats() > ath_update_survey_nf() > survey->filled |= SURVEY_INFO_NOISE_DBM; > > The identical variables sc->cur_survey->filled and > sc->survey[pos].filled is accessed without holding this lock, through: > ath9k_config() > ath_chanctx_set_channel() > ath_set_channel() > sc->cur_survey->filled &= ~SURVEY_INFO_IN_USE; > sc->cur_survey->filled |= SURVEY_INFO_IN_USE; > else if (!(sc->survey[pos].filled & SURVEY_INFO_IN_USE)) > ath_update_survey_nf > survey->filled |= SURVEY_INFO_NOISE_DBM; > > Thus, possible data races may occur. > > To fix these data races, in ath_set_channel(), these variables are > accessed with holding the spinlock common->cc_lock. > > These data races are found by the runtime testing of our tool DILP-2. > > Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
I need a detailed review from somone familiar with ath9k before I can consider applying this.
-- https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
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