linux-kernel - [PATCH] RAS/AMD/ATL: Fix array overflow in get_logical_coh_st_fabric_id

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Date: Wed, 31 Jan 2024 11:24:25 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Muralidhara M K <muralidhara.mk@....com>
Cc: Yazen Ghannam <Yazen.Ghannam@....com>, Tony Luck <tony.luck@...el.com>,
	Borislav Petkov <bp@...en8.de>, linux-edac@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH] RAS/AMD/ATL: Fix array overflow in
 get_logical_coh_st_fabric_id_mi300()

Check against ARRAY_SIZE() which is the number of elements instead of
sizeof() which is the number of bytes.  Otherwise we potentially read
beyond the end of the phy_to_log_coh_st_map_mi300[] array.

Fixes: 453f0ae79732 ("RAS/AMD/ATL: Add MI300 support")
Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
---
 drivers/ras/amd/atl/denormalize.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/ras/amd/atl/denormalize.c b/drivers/ras/amd/atl/denormalize.c
index d5d0e1fda159..49a900e066f1 100644
--- a/drivers/ras/amd/atl/denormalize.c
+++ b/drivers/ras/amd/atl/denormalize.c
@@ -405,7 +405,7 @@ static const u16 phy_to_log_coh_st_map_mi300[] = {
 
 static u16 get_logical_coh_st_fabric_id_mi300(struct addr_ctx *ctx)
 {
-	if (ctx->inst_id >= sizeof(phy_to_log_coh_st_map_mi300)) {
+	if (ctx->inst_id >= ARRAY_SIZE(phy_to_log_coh_st_map_mi300)) {
 		atl_debug(ctx, "Instance ID out of range");
 		return ~0;
 	}
-- 
2.43.0