6.6-stable review patch. If anyone has any objections, please let me know.
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From: Thomas Weißschuh thomas.weissschuh@linutronix.de
commit 000f6d588a8f3d128f89351058dc04d38e54a327 upstream.
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@li... Cc: stable@vger.kernel.org Signed-off-by: Rob Herring (Arm) robh@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/of/address.c | 5 +++++ 1 file changed, 5 insertions(+)
--- 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> @@ -1142,7 +1143,11 @@ static int __of_address_to_resource(stru 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;