From: rentao.bupt@gmail.com
To: Wim Van Sebroeck <wim@linux-watchdog.org>,
Guenter Roeck <linux@roeck-us.net>, Joel Stanley <joel@jms.id.au>,
Andrew Jeffery <andrew@aj.id.au>,
linux-watchdog@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-aspeed@lists.ozlabs.org, linux-kernel@vger.kernel.org,
openbmc@lists.ozlabs.org, Tao Ren <taoren@fb.com>,
Amithash Prasad <amithash@fb.com>
Cc: Tao Ren <rentao.bupt@gmail.com>
Subject: [PATCH v2] watchdog: aspeed: fix integer overflow in set_timeout handler
Date: Thu, 15 Apr 2021 19:13:37 -0700 [thread overview]
Message-ID: <20210416021337.18715-1-rentao.bupt@gmail.com> (raw)
From: Tao Ren <rentao.bupt@gmail.com>
Fix the time comparison (timeout vs. max_hw_heartbeat_ms) in set_timeout
handler to avoid potential integer overflow when the supplied timeout is
greater than aspeed's maximum allowed timeout (4294 seconds).
Fixes: efa859f7d786 ("watchdog: Add Aspeed watchdog driver")
Reported-by: Amithash Prasad <amithash@fb.com>
Signed-off-by: Tao Ren <rentao.bupt@gmail.com>
---
Changes in v2:
- do not touch "wdd->timeout": only "max_hw_heartbeat_ms * 1000" is
updated to "max_hw_heartbeat_ms / 1000".
drivers/watchdog/aspeed_wdt.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/watchdog/aspeed_wdt.c b/drivers/watchdog/aspeed_wdt.c
index 7e00960651fa..507fd815d767 100644
--- a/drivers/watchdog/aspeed_wdt.c
+++ b/drivers/watchdog/aspeed_wdt.c
@@ -147,7 +147,7 @@ static int aspeed_wdt_set_timeout(struct watchdog_device *wdd,
wdd->timeout = timeout;
- actual = min(timeout, wdd->max_hw_heartbeat_ms * 1000);
+ actual = min(timeout, wdd->max_hw_heartbeat_ms / 1000);
writel(actual * WDT_RATE_1MHZ, wdt->base + WDT_RELOAD_VALUE);
writel(WDT_RESTART_MAGIC, wdt->base + WDT_RESTART);
--
2.17.1
next reply other threads:[~2021-04-16 2:13 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-16 2:13 rentao.bupt [this message]
2021-04-16 5:07 ` [PATCH v2] watchdog: aspeed: fix integer overflow in set_timeout handler Guenter Roeck
2021-04-16 18:25 ` Tao Ren
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