From: Yazen Ghannam <yazen.ghannam@amd.com>
Date: Tue, 19 Mar 2024 06:33:21 -0500
Subject: RAS/AMD/FMPM: Avoid NULL ptr deref in get_saved_records()
Git-commit: 4b0e527c9970a15ac9ec8fc44af957725b854c29
Patch-mainline: v6.9-rc2
References: jsc#PED-7619

An old, invalid record should be cleared and skipped.

Currently, the record is cleared in ERST, but it is not skipped. This
leads to a NULL pointer dereference when attempting to copy the old
record to the new record.

Continue the loop after clearing an old, invalid record to skip it.

Fixes: 6f15e617cc99 ("RAS: Introduce a FRU memory poison manager")
Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Tested-by: Muralidhara M K <muralidhara.mk@amd.com>
Link: https://lore.kernel.org/r/20240319113322.280096-2-yazen.ghannam@amd.com

Acked-by: Nikolay Borisov <nik.borisov@suse.com>
---
 drivers/ras/amd/fmpm.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/ras/amd/fmpm.c b/drivers/ras/amd/fmpm.c
index 2f4ac9591c8f..9d25195b4538 100644
--- a/drivers/ras/amd/fmpm.c
+++ b/drivers/ras/amd/fmpm.c
@@ -676,8 +676,10 @@ static int get_saved_records(void)
 		}
 
 		new = get_valid_record(old);
-		if (!new)
+		if (!new) {
 			erst_clear(record_id);
+			continue;
+		}
 
 		/* Restore the record */
 		memcpy(new, old, len);