From 1e92af09fab1b5589f3a7ae68109e3c6a5ca6c6e Mon Sep 17 00:00:00 2001 From: Qiuxu Zhuo Date: Thu, 7 Dec 2023 09:45:12 +0800 Subject: [PATCH] EDAC/skx_common: Filter out the invalid address Decoding an invalid address with certain firmware decoders could cause a #PF (Page Fault) in the EFI runtime context, which could subsequently hang the system. To make {i10nm,skx}_edac more robust against such bogus firmware decoders, filter out invalid addresses before allowing the firmware decoder to process them. Suggested-by: Tony Luck Signed-off-by: Qiuxu Zhuo Signed-off-by: Tony Luck Link: https://lore.kernel.org/r/20231207014512.78564-1-qiuxu.zhuo@intel.com --- drivers/edac/skx_common.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/edac/skx_common.c b/drivers/edac/skx_common.c index ce3e0069e028..9c5b6f8bd8bd 100644 --- a/drivers/edac/skx_common.c +++ b/drivers/edac/skx_common.c @@ -648,6 +648,10 @@ int skx_mce_check_error(struct notifier_block *nb, unsigned long val, memset(&res, 0, sizeof(res)); res.mce = mce; res.addr = mce->addr & MCI_ADDR_PHYSADDR; + if (!pfn_to_online_page(res.addr >> PAGE_SHIFT)) { + pr_err("Invalid address 0x%llx in IA32_MC%d_ADDR\n", mce->addr, mce->bank); + return NOTIFY_DONE; + } /* Try driver decoder first */ if (!(driver_decode && driver_decode(&res))) {