Messages in this thread Patch in this message | | | From | Antonio Borneo <> | Subject | [PATCH 5/7] irqchip/stm32-exti: prevent illegal read due to unbounded DT value | Date | Tue, 10 May 2022 18:41:21 +0200 |
| |
The value hwirq is received from DT. If it exceeds the maximum valid value it causes the code to address unexisting irq chips.
Check the value of hwirq before using it.
Signed-off-by: Antonio Borneo <antonio.borneo@foss.st.com> --- drivers/irqchip/irq-stm32-exti.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/irqchip/irq-stm32-exti.c b/drivers/irqchip/irq-stm32-exti.c index 3f6d524a87fe..509a4a96a99b 100644 --- a/drivers/irqchip/irq-stm32-exti.c +++ b/drivers/irqchip/irq-stm32-exti.c @@ -724,6 +724,9 @@ static int stm32_exti_h_domain_alloc(struct irq_domain *dm, int bank; hwirq = fwspec->param[0]; + if (hwirq >= host_data->drv_data->bank_nr * IRQS_PER_BANK) + return -EINVAL; + bank = hwirq / IRQS_PER_BANK; chip_data = &host_data->chips_data[bank]; -- 2.36.0
| |