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bh=Opf6R8LxH3XmrLOtRjsmmDOCRi/eO2vj5ieONa+2CYo=; b=Rwax3/qLPSx3yzTmh8S+PoQUni28GZqAJLC9qN6gyF35ksoDjj7VGpv6FwfE+dHCdq K3t/iFenRUgIzxz+27+mkPTGEdX5lDxfQ0lB9JR2e137wYNLjajefr5CmkJOTyB0q2t+ jAiVT3o3E7bWL6xZQzo0kT6qoAIG5/TBvT9m8hVjSX2bierxdpQu4V11CFXiqoA79+iq 1BVNkc7cAvRhfblIbXlbC7EN2UgtXYL04D9njvJqZRbCmaUx6jMFVNbSPfpl0l7hfhrN ifBbwLV2pj76X+P+Zfdm4HKp71xj+gHFSZ20R8FHU1QF1zNgtd+KXVNOoeQUb2NP91lW 0JIA== X-Gm-Message-State: AOAM532w2EDHDTEtCze5xzYpOrVL4dbqRkH1rIYy4rRoXfC/AiHBSIQu qhsOhmQ01cqhT+uizQtsSzt1dbea78g= X-Received: by 2002:a54:4001:: with SMTP id x1mr5217149oie.21.1618549656936; Thu, 15 Apr 2021 22:07:36 -0700 (PDT) Received: from server.roeck-us.net ([2600:1700:e321:62f0:329c:23ff:fee3:9d7c]) by smtp.gmail.com with ESMTPSA id w1sm1127063otq.75.2021.04.15.22.07.33 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 15 Apr 2021 22:07:35 -0700 (PDT) Sender: Guenter Roeck Subject: Re: [PATCH v2] watchdog: aspeed: fix integer overflow in set_timeout handler To: rentao.bupt@gmail.com, Wim Van Sebroeck , Joel Stanley , Andrew Jeffery , 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 , Amithash Prasad References: <20210416021337.18715-1-rentao.bupt@gmail.com> From: Guenter Roeck Autocrypt: addr=linux@roeck-us.net; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20210416021337.18715-1-rentao.bupt@gmail.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 4/15/21 7:13 PM, rentao.bupt@gmail.com wrote: > From: Tao Ren > > 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). > I think this is the wrong focus: What this fixes is the wrong hardware timeout calculation. Again, I think that the wrong calculation leads to the overflow should not be the focus of this patch, though it can of course be mentioned. I'll leave it up to Wim to decide if he wants to apply the patch with the current explanation. Thanks, Guenter > Fixes: efa859f7d786 ("watchdog: Add Aspeed watchdog driver") > Reported-by: Amithash Prasad > Signed-off-by: Tao Ren > --- > 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); >