Hi Matt,
Please Acknowledge this.
Regards
Arvind Yadav
On Monday 09 January 2017 02:30 PM, Marc Zyngier wrote:
On 09/01/17 08:08, Arvind Yadav wrote:
Here, If ioremap_nocache will fail. It will return NULL.
Kernel can run into a NULL-pointer dereference.
This error check will avoid NULL pointer dereference.
Signed-off-by: Arvind Yadav <arvind.yadav...@gmail.com>
---
drivers/irqchip/irq-mips-gic.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/irqchip/irq-mips-gic.c b/drivers/irqchip/irq-mips-gic.c
index c01c09e..eeea2e8 100644
--- a/drivers/irqchip/irq-mips-gic.c
+++ b/drivers/irqchip/irq-mips-gic.c
@@ -979,6 +979,8 @@ static void __init __gic_init(unsigned long gic_base_addr,
__gic_base_addr = gic_base_addr;
gic_base = ioremap_nocache(gic_base_addr, gic_addrspace_size);
+ if (!gic_base)
+ panic("Failed to map GIC memory");
So you're replacing a panic due to dereferencing a NULL pointer with
another panic -- not much progress here. I appreciate that the message
is a bit more explicit, but is there something slightly less drastic we
could do? Like returning an error code and see if the kernel otherwise
recovers (possibly with reduced functionality)?
gicconfig = gic_read(GIC_REG(SHARED, GIC_SH_CONFIG));
gic_shared_intrs = (gicconfig & GIC_SH_CONFIG_NUMINTRS_MSK) >>
Thanks,
M.
