amd64_edac: Beef up early exit reporting

Add paranoid checks for the sys address before going off and decoding
it.

Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>

1 files changed, 12 insertions, 1 deletions

diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
index 4bba43e7ee85..e4ad09110b96 100644
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -1380,9 +1380,20 @@ static int f10_match_to_this_node(struct amd64_pvt *pvt, int range,
         debugf1("(range %d) SystemAddr= 0x%llx Limit=0x%llx\n",
                 range, sys_addr, get_dram_limit(pvt, range));
 
+        if (dhar_valid(pvt) &&
+            dhar_base(pvt) <= sys_addr &&
+            sys_addr < BIT_64(32)) {
+                amd64_warn("Huh? Address is in the MMIO hole: 0x%016llx\n",
+                            sys_addr);
+                return -EINVAL;
+        }
+
         if (intlv_en &&
-            (intlv_sel != ((sys_addr >> 12) & intlv_en)))
+            (intlv_sel != ((sys_addr >> 12) & intlv_en))) {
+                amd64_warn("Botched intlv bits, en: 0x%x, sel: 0x%x\n",
+                           intlv_en, intlv_sel);
                 return -EINVAL;
+        }
 
         sys_addr = f10_swap_interleaved_region(pvt, sys_addr);