1 files changed, 13 insertions, 1 deletions

diff --git a/arch/mips/kernel/prom.c b/arch/mips/kernel/prom.c
index 437a174e3ef9..28bf01961bb2 100644
--- a/arch/mips/kernel/prom.c
+++ b/arch/mips/kernel/prom.c
@@ -41,7 +41,19 @@ char *mips_get_machine_name(void)
 #ifdef CONFIG_USE_OF
 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
 {
-        return add_memory_region(base, size, BOOT_MEM_RAM);
+        if (base >= PHYS_ADDR_MAX) {
+                pr_warn("Trying to add an invalid memory region, skipped\n");
+                return;
+        }
+
+        /* Truncate the passed memory region instead of type casting */
+        if (base + size - 1 >= PHYS_ADDR_MAX || base + size < base) {
+                pr_warn("Truncate memory region %llx @ %llx to size %llx\n",
+                        size, base, PHYS_ADDR_MAX - base);
+                size = PHYS_ADDR_MAX - base;
+        }
+
+        add_memory_region(base, size, BOOT_MEM_RAM);
 }
 
 int __init early_init_dt_reserve_memory_arch(phys_addr_t base,