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[130.37.198.127]) by smtp.gmail.com with ESMTPSA id l26-20020a170906079a00b008966488a5f1sm5714368ejc.144.2023.02.12.11.01.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 12 Feb 2023 11:01:20 -0800 (PST) From: Pietro Borrello Date: Sun, 12 Feb 2023 19:00:01 +0000 Subject: [PATCH v4 3/5] HID: bigben: use spinlock to safely schedule workers MIME-Version: 1.0 Message-Id: <20230125-hid-unregister-leds-v4-3-7860c5763c38@diag.uniroma1.it> References: <20230125-hid-unregister-leds-v4-0-7860c5763c38@diag.uniroma1.it> In-Reply-To: <20230125-hid-unregister-leds-v4-0-7860c5763c38@diag.uniroma1.it> To: Jiri Kosina , Benjamin Tissoires , Hanno Zulla , Hanno Zulla , Greg Kroah-Hartman Cc: Cristiano Giuffrida , "Bos, H.J." , Jakob Koschel , Jiri Kosina , Roderick Colenbrander , linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, Pietro Borrello X-Mailer: b4 0.12.1 X-Developer-Signature: v=1; a=ed25519-sha256; t=1676228478; l=2127; i=borrello@diag.uniroma1.it; s=20221223; h=from:subject:message-id; bh=MYGmtcK5MTdP0vFzx8JLN9Po931xJSB7z7FwhIXyl+U=; b=iFVDjOCX3HA+8r29BmEEv0xZGr/hxue/0Bmh0Az/QiCIXbTODweCqO5W7zIHo2HFfkW8neC2m/KO EOYkpQwODoIif/BHyDetJ19fzHumaoxcUUuLooAdXWrUN688K35Y X-Developer-Key: i=borrello@diag.uniroma1.it; a=ed25519; pk=4xRQbiJKehl7dFvrG33o2HpveMrwQiUPKtIlObzKmdY= Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org Use spinlocks to deal with workers introducing a wrapper bigben_schedule_work(), and several spinlock checks. Otherwise, bigben_set_led() may schedule bigben->worker after the structure has been freed, causing a use-after-free. Fixes: 4eb1b01de5b9 ("HID: hid-bigbenff: fix race condition for scheduled work during removal") Signed-off-by: Pietro Borrello --- drivers/hid/hid-bigbenff.c | 18 ++++++++++++------ 1 file changed, 12 insertions(+), 6 deletions(-) diff --git a/drivers/hid/hid-bigbenff.c b/drivers/hid/hid-bigbenff.c index b98c5f31c184..9d6560db762b 100644 --- a/drivers/hid/hid-bigbenff.c +++ b/drivers/hid/hid-bigbenff.c @@ -185,6 +185,15 @@ struct bigben_device { struct work_struct worker; }; +static inline void bigben_schedule_work(struct bigben_device *bigben) +{ + unsigned long flags; + + spin_lock_irqsave(&bigben->lock, flags); + if (!bigben->removed) + schedule_work(&bigben->worker); + spin_unlock_irqrestore(&bigben->lock, flags); +} static void bigben_worker(struct work_struct *work) { @@ -197,9 +206,6 @@ static void bigben_worker(struct work_struct *work) u32 len; unsigned long flags; - if (bigben->removed) - return; - buf = hid_alloc_report_buf(bigben->report, GFP_KERNEL); if (!buf) return; @@ -285,7 +291,7 @@ static int hid_bigben_play_effect(struct input_dev *dev, void *data, bigben->work_ff = true; spin_unlock_irqrestore(&bigben->lock, flags); - schedule_work(&bigben->worker); + bigben_schedule_work(bigben); } return 0; @@ -320,7 +326,7 @@ static void bigben_set_led(struct led_classdev *led, if (work) { bigben->work_led = true; - schedule_work(&bigben->worker); + bigben_schedule_work(bigben); } return; } @@ -450,7 +456,7 @@ static int bigben_probe(struct hid_device *hid, bigben->left_motor_force = 0; bigben->work_led = true; bigben->work_ff = true; - schedule_work(&bigben->worker); + bigben_schedule_work(bigben); hid_info(hid, "LED and force feedback support for BigBen gamepad\n");