linux-kernel - [PATCH] RAS/AMD/FMPM: Avoid NULL ptr deref in get_saved

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Date: Tue, 12 Mar 2024 10:49:37 -0500
From: Yazen Ghannam <yazen.ghannam@....com>
To: <bp@...en8.de>, <tony.luck@...el.com>, <linux-edac@...r.kernel.org>
CC: <linux-kernel@...r.kernel.org>, <avadhut.naik@....com>,
	<john.allen@....com>, <naveenkrishna.chatradhi@....com>,
	<muralidhara.mk@....com>, Yazen Ghannam <yazen.ghannam@....com>
Subject: [PATCH] RAS/AMD/FMPM: Avoid NULL ptr deref in get_saved_records()

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@....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);

base-commit: 855684c7d938c2442f07eabc154e7532b4c1fbf9
-- 
2.34.1