From: Evgeny Kuznetsov <EXT-Eugeny.Kuznetsov@nokia.com> To: tony@atomide.com Cc: linux-omap@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux@arm.linux.org.uk, ext-eugeny.kuznetsov@nokia.com Subject: [PATCHv3 1/1] omap: Ptr "isr_reg" tracked as NULL was dereferenced Date: Mon, 8 Nov 2010 11:38:36 +0300 [thread overview] Message-ID: <cd6fa21776a4564d602cc072358a4bf79a9fe883.1289205105.git.EXT-Eugeny.Kuznetsov@nokia.com> (raw) From: Evgeny Kuznetsov <ext-eugeny.kuznetsov@nokia.com> Value of "isr_reg" pointer is depend on configuration and GPIO method. Potentially it may have NULL value and it is dereferenced later in code. Warning and exit from function are added in this case. Signed-off-by: Evgeny Kuznetsov <EXT-Eugeny.Kuznetsov@nokia.com> --- arch/arm/plat-omap/gpio.c | 5 +++++ 1 files changed, 5 insertions(+), 0 deletions(-) diff --git a/arch/arm/plat-omap/gpio.c b/arch/arm/plat-omap/gpio.c index c05c653..e0e2fa7 100644 --- a/arch/arm/plat-omap/gpio.c +++ b/arch/arm/plat-omap/gpio.c @@ -1318,6 +1318,10 @@ static void gpio_irq_handler(unsigned int irq, struct irq_desc *desc) if (bank->method == METHOD_GPIO_44XX) isr_reg = bank->base + OMAP4_GPIO_IRQSTATUS0; #endif + + if (WARN_ON(!isr_reg)) + goto exit; + while(1) { u32 isr_saved, level_mask = 0; u32 enabled; @@ -1377,6 +1381,7 @@ static void gpio_irq_handler(unsigned int irq, struct irq_desc *desc) configured, we must unmask the bank interrupt only after handler(s) are executed in order to avoid spurious bank interrupt */ +exit: if (!unmasked) desc->chip->unmask(irq); -- 1.6.3.3
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From: EXT-Eugeny.Kuznetsov@nokia.com (Evgeny Kuznetsov) To: linux-arm-kernel@lists.infradead.org Subject: [PATCHv3 1/1] omap: Ptr "isr_reg" tracked as NULL was dereferenced Date: Mon, 8 Nov 2010 11:38:36 +0300 [thread overview] Message-ID: <cd6fa21776a4564d602cc072358a4bf79a9fe883.1289205105.git.EXT-Eugeny.Kuznetsov@nokia.com> (raw) From: Evgeny Kuznetsov <ext-eugeny.kuznetsov@nokia.com> Value of "isr_reg" pointer is depend on configuration and GPIO method. Potentially it may have NULL value and it is dereferenced later in code. Warning and exit from function are added in this case. Signed-off-by: Evgeny Kuznetsov <EXT-Eugeny.Kuznetsov@nokia.com> --- arch/arm/plat-omap/gpio.c | 5 +++++ 1 files changed, 5 insertions(+), 0 deletions(-) diff --git a/arch/arm/plat-omap/gpio.c b/arch/arm/plat-omap/gpio.c index c05c653..e0e2fa7 100644 --- a/arch/arm/plat-omap/gpio.c +++ b/arch/arm/plat-omap/gpio.c @@ -1318,6 +1318,10 @@ static void gpio_irq_handler(unsigned int irq, struct irq_desc *desc) if (bank->method == METHOD_GPIO_44XX) isr_reg = bank->base + OMAP4_GPIO_IRQSTATUS0; #endif + + if (WARN_ON(!isr_reg)) + goto exit; + while(1) { u32 isr_saved, level_mask = 0; u32 enabled; @@ -1377,6 +1381,7 @@ static void gpio_irq_handler(unsigned int irq, struct irq_desc *desc) configured, we must unmask the bank interrupt only after handler(s) are executed in order to avoid spurious bank interrupt */ +exit: if (!unmasked) desc->chip->unmask(irq); -- 1.6.3.3
next reply other threads:[~2010-11-08 8:44 UTC|newest] Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top 2010-11-08 8:38 Evgeny Kuznetsov [this message] 2010-11-08 8:38 ` [PATCHv3 1/1] omap: Ptr "isr_reg" tracked as NULL was dereferenced Evgeny Kuznetsov 2010-11-16 21:39 ` Tony Lindgren 2010-11-16 21:39 ` Tony Lindgren
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