of: address: Report error on resource bounds overflow

The members "start" and "end" of struct resource are of type
"resource_size_t" which can be 32bit wide.
Values read from OF however are always 64bit wide.
Avoid silently truncating the value and instead return an error value.

This can happen on real systems when the DT was created for a
PAE-enabled kernel and a non-PAE kernel is actually running.
For example with an arm defconfig and "qemu-system-arm -M virt".

Link: https://bugs.launchpad.net/qemu/+bug/1790975
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Tested-by: Nam Cao <namcao@linutronix.de>
Reviewed-by: Nam Cao <namcao@linutronix.de>
Link: https://lore.kernel.org/r/20240905-of-resource-overflow-v1-1-0cd8bb92cc1f@linutronix.de
Cc: stable@vger.kernel.org
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>

diff --git a/drivers/of/address.c b/drivers/of/address.c
index d669ce25b5f9c1f77246c25438fb0d18853d17c0..7e59283a44723c9b80a7660eb562f7d2da1101c5 100644 (file)
--- a/drivers/of/address.c
+++ b/drivers/of/address.c
@@ -8,6 +8,7 @@
 #include <linux/logic_pio.h>
 #include <linux/module.h>
 #include <linux/of_address.h>
+#include <linux/overflow.h>
 #include <linux/pci.h>
 #include <linux/pci_regs.h>
 #include <linux/sizes.h>
@@ -1061,7 +1062,11 @@ static int __of_address_to_resource(struct device_node *dev, int index, int bar_
        if (of_mmio_is_nonposted(dev))
                flags |= IORESOURCE_MEM_NONPOSTED;
 
+       if (overflows_type(taddr, r->start))
+               return -EOVERFLOW;
        r->start = taddr;
+       if (overflows_type(taddr + size - 1, r->end))
+               return -EOVERFLOW;
        r->end = taddr + size - 1;
        r->flags = flags;
        r->name = name ? name : dev->full_name;