* [PATCH 0/6] treewide: test clock rate to avoid division by 0
@ 2016-03-02 22:33 Wolfram Sang
2016-03-02 22:33 ` [PATCH 5/6] watchdog: atlas7_wdt: " Wolfram Sang
2016-03-02 22:33 ` [PATCH 6/6] watchdog: tangox_wdt: " Wolfram Sang
0 siblings, 2 replies; 7+ messages in thread
From: Wolfram Sang @ 2016-03-02 22:33 UTC (permalink / raw)
To: linux-kernel
Cc: linux-renesas-soc, linux-arm-kernel, linux-ide, linux-pwm,
linux-watchdog, netdev
Here is the outcome of researching if the result of clk_get_rate() was directly
used as a divisor without checking if it is 0. Inspired by a Coverity report.
Wolfram Sang (6):
ide: palm_bk3710: test clock rate to avoid division by 0
net: ethernet: renesas: ravb_main: test clock rate to avoid division
by 0
pwm: pwm-img: test clock rate to avoid division by 0
pwm: pwm-lpc18xx-sct: test clock rate to avoid division by 0
watchdog: atlas7_wdt: test clock rate to avoid division by 0
watchdog: tangox_wdt: test clock rate to avoid division by 0
drivers/ide/palm_bk3710.c | 2 ++
drivers/net/ethernet/renesas/ravb_main.c | 3 +++
drivers/pwm/pwm-img.c | 5 +++++
drivers/pwm/pwm-lpc18xx-sct.c | 2 ++
drivers/watchdog/atlas7_wdt.c | 5 +++++
drivers/watchdog/tangox_wdt.c | 2 ++
6 files changed, 19 insertions(+)
--
2.7.0
^ permalink raw reply [flat|nested] 7+ messages in thread* [PATCH 5/6] watchdog: atlas7_wdt: test clock rate to avoid division by 0
2016-03-02 22:33 [PATCH 0/6] treewide: test clock rate to avoid division by 0 Wolfram Sang
@ 2016-03-02 22:33 ` Wolfram Sang
2016-03-03 4:25 ` Guenter Roeck
2016-03-06 9:09 ` Wim Van Sebroeck
2016-03-02 22:33 ` [PATCH 6/6] watchdog: tangox_wdt: " Wolfram Sang
1 sibling, 2 replies; 7+ messages in thread
From: Wolfram Sang @ 2016-03-02 22:33 UTC (permalink / raw)
To: linux-kernel
Cc: linux-renesas-soc, Wim Van Sebroeck, Guenter Roeck,
linux-watchdog
From: Wolfram Sang <wsa+renesas@sang-engineering.com>
The clk API may return 0 on clk_get_rate, so we should check the result before
using it as a divisor.
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
---
Should go individually via subsystem tree.
drivers/watchdog/atlas7_wdt.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/watchdog/atlas7_wdt.c b/drivers/watchdog/atlas7_wdt.c
index df6d9242a31958..ed80734befae16 100644
--- a/drivers/watchdog/atlas7_wdt.c
+++ b/drivers/watchdog/atlas7_wdt.c
@@ -154,6 +154,11 @@ static int atlas7_wdt_probe(struct platform_device *pdev)
writel(0, wdt->base + ATLAS7_WDT_CNT_CTRL);
wdt->tick_rate = clk_get_rate(clk);
+ if (!wdt->tick_rate) {
+ ret = -EINVAL;
+ goto err1;
+ }
+
wdt->clk = clk;
atlas7_wdd.min_timeout = 1;
atlas7_wdd.max_timeout = UINT_MAX / wdt->tick_rate;
--
2.7.0
^ permalink raw reply related [flat|nested] 7+ messages in thread* Re: [PATCH 5/6] watchdog: atlas7_wdt: test clock rate to avoid division by 0
2016-03-02 22:33 ` [PATCH 5/6] watchdog: atlas7_wdt: " Wolfram Sang
@ 2016-03-03 4:25 ` Guenter Roeck
2016-03-06 9:09 ` Wim Van Sebroeck
1 sibling, 0 replies; 7+ messages in thread
From: Guenter Roeck @ 2016-03-03 4:25 UTC (permalink / raw)
To: Wolfram Sang
Cc: linux-kernel, linux-renesas-soc, Wim Van Sebroeck, linux-watchdog
On Wed, Mar 02, 2016 at 11:33:36PM +0100, Wolfram Sang wrote:
> From: Wolfram Sang <wsa+renesas@sang-engineering.com>
>
> The clk API may return 0 on clk_get_rate, so we should check the result before
> using it as a divisor.
>
> Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
> ---
>
> Should go individually via subsystem tree.
>
> drivers/watchdog/atlas7_wdt.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/drivers/watchdog/atlas7_wdt.c b/drivers/watchdog/atlas7_wdt.c
> index df6d9242a31958..ed80734befae16 100644
> --- a/drivers/watchdog/atlas7_wdt.c
> +++ b/drivers/watchdog/atlas7_wdt.c
> @@ -154,6 +154,11 @@ static int atlas7_wdt_probe(struct platform_device *pdev)
> writel(0, wdt->base + ATLAS7_WDT_CNT_CTRL);
>
> wdt->tick_rate = clk_get_rate(clk);
> + if (!wdt->tick_rate) {
> + ret = -EINVAL;
> + goto err1;
> + }
> +
> wdt->clk = clk;
> atlas7_wdd.min_timeout = 1;
> atlas7_wdd.max_timeout = UINT_MAX / wdt->tick_rate;
> --
> 2.7.0
>
^ permalink raw reply [flat|nested] 7+ messages in thread* Re: [PATCH 5/6] watchdog: atlas7_wdt: test clock rate to avoid division by 0
2016-03-02 22:33 ` [PATCH 5/6] watchdog: atlas7_wdt: " Wolfram Sang
2016-03-03 4:25 ` Guenter Roeck
@ 2016-03-06 9:09 ` Wim Van Sebroeck
1 sibling, 0 replies; 7+ messages in thread
From: Wim Van Sebroeck @ 2016-03-06 9:09 UTC (permalink / raw)
To: Wolfram Sang
Cc: linux-kernel, linux-renesas-soc, Guenter Roeck, linux-watchdog
Hi Wolfram,
> From: Wolfram Sang <wsa+renesas@sang-engineering.com>
>
> The clk API may return 0 on clk_get_rate, so we should check the result before
> using it as a divisor.
>
> Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
> ---
>
> Should go individually via subsystem tree.
>
> drivers/watchdog/atlas7_wdt.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/drivers/watchdog/atlas7_wdt.c b/drivers/watchdog/atlas7_wdt.c
> index df6d9242a31958..ed80734befae16 100644
> --- a/drivers/watchdog/atlas7_wdt.c
> +++ b/drivers/watchdog/atlas7_wdt.c
> @@ -154,6 +154,11 @@ static int atlas7_wdt_probe(struct platform_device *pdev)
> writel(0, wdt->base + ATLAS7_WDT_CNT_CTRL);
>
> wdt->tick_rate = clk_get_rate(clk);
> + if (!wdt->tick_rate) {
> + ret = -EINVAL;
> + goto err1;
> + }
> +
> wdt->clk = clk;
> atlas7_wdd.min_timeout = 1;
> atlas7_wdd.max_timeout = UINT_MAX / wdt->tick_rate;
> --
> 2.7.0
>
Patch has been added to linux-watchdog-next.
Kind regards,
Wim.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [PATCH 6/6] watchdog: tangox_wdt: test clock rate to avoid division by 0
2016-03-02 22:33 [PATCH 0/6] treewide: test clock rate to avoid division by 0 Wolfram Sang
2016-03-02 22:33 ` [PATCH 5/6] watchdog: atlas7_wdt: " Wolfram Sang
@ 2016-03-02 22:33 ` Wolfram Sang
2016-03-03 4:26 ` Guenter Roeck
1 sibling, 1 reply; 7+ messages in thread
From: Wolfram Sang @ 2016-03-02 22:33 UTC (permalink / raw)
To: linux-kernel
Cc: linux-renesas-soc, Wim Van Sebroeck, Guenter Roeck,
linux-watchdog
From: Wolfram Sang <wsa+renesas@sang-engineering.com>
The clk API may return 0 on clk_get_rate, so we should check the result before
using it as a divisor.
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
---
Should go individually via subsystem tree.
drivers/watchdog/tangox_wdt.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/watchdog/tangox_wdt.c b/drivers/watchdog/tangox_wdt.c
index 709c1ed6fd79b9..cc702718ae4dbb 100644
--- a/drivers/watchdog/tangox_wdt.c
+++ b/drivers/watchdog/tangox_wdt.c
@@ -139,6 +139,8 @@ static int tangox_wdt_probe(struct platform_device *pdev)
return err;
dev->clk_rate = clk_get_rate(dev->clk);
+ if (!dev->clk_rate)
+ return -EINVAL;
dev->wdt.parent = &pdev->dev;
dev->wdt.info = &tangox_wdt_info;
--
2.7.0
^ permalink raw reply related [flat|nested] 7+ messages in thread
* Re: [PATCH 6/6] watchdog: tangox_wdt: test clock rate to avoid division by 0
2016-03-02 22:33 ` [PATCH 6/6] watchdog: tangox_wdt: " Wolfram Sang
@ 2016-03-03 4:26 ` Guenter Roeck
2016-03-03 8:12 ` Wolfram Sang
0 siblings, 1 reply; 7+ messages in thread
From: Guenter Roeck @ 2016-03-03 4:26 UTC (permalink / raw)
To: Wolfram Sang
Cc: linux-kernel, linux-renesas-soc, Wim Van Sebroeck, linux-watchdog
On Wed, Mar 02, 2016 at 11:33:37PM +0100, Wolfram Sang wrote:
> From: Wolfram Sang <wsa+renesas@sang-engineering.com>
>
> The clk API may return 0 on clk_get_rate, so we should check the result before
> using it as a divisor.
>
> Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
> ---
>
> Should go individually via subsystem tree.
>
> drivers/watchdog/tangox_wdt.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/drivers/watchdog/tangox_wdt.c b/drivers/watchdog/tangox_wdt.c
> index 709c1ed6fd79b9..cc702718ae4dbb 100644
> --- a/drivers/watchdog/tangox_wdt.c
> +++ b/drivers/watchdog/tangox_wdt.c
> @@ -139,6 +139,8 @@ static int tangox_wdt_probe(struct platform_device *pdev)
> return err;
>
> dev->clk_rate = clk_get_rate(dev->clk);
> + if (!dev->clk_rate)
> + return -EINVAL;
May be a nitpick, but clk_disable_unprepare() is missing.
Guenter
>
> dev->wdt.parent = &pdev->dev;
> dev->wdt.info = &tangox_wdt_info;
> --
> 2.7.0
>
^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2016-03-06 9:09 UTC | newest]
Thread overview: 7+ messages (download: mbox.gz follow: Atom feed
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2016-03-02 22:33 [PATCH 0/6] treewide: test clock rate to avoid division by 0 Wolfram Sang
2016-03-02 22:33 ` [PATCH 5/6] watchdog: atlas7_wdt: " Wolfram Sang
2016-03-03 4:25 ` Guenter Roeck
2016-03-06 9:09 ` Wim Van Sebroeck
2016-03-02 22:33 ` [PATCH 6/6] watchdog: tangox_wdt: " Wolfram Sang
2016-03-03 4:26 ` Guenter Roeck
2016-03-03 8:12 ` Wolfram Sang
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