linux-kernel - [PATCH][next] drm/amd/pm: fix out-of-bound read on pptable->SkuReserved

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Message-Id: <20201028124316.109886-1-colin.king@canonical.com>
Date:   Wed, 28 Oct 2020 12:43:16 +0000
From:   Colin King <colin.king@...onical.com>
To:     Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Hawking Zhang <Hawking.Zhang@....com>,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH][next] drm/amd/pm: fix out-of-bound read on pptable->SkuReserved

From: Colin Ian King <colin.king@...onical.com>

A recent change added two uint16_t elements to PPTable_t and reduced the
uint32_t array down to 8 elements. This results in the dev_info printing
of pptable->SkuReserved[8] accessing a value that is out-of-range on
array SkuReserved.  The array has been shrunk by 1 element, so remove
this extraneous dev_info message.

Addresses-Coverity: ("Out-of-bounds read")
Fixes: 1dc3c5a95b08 ("drm/amd/pm: update driver if file for sienna cichlid")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/gpu/drm/amd/pm/swsmu/smu11/sienna_cichlid_ppt.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/pm/swsmu/smu11/sienna_cichlid_ppt.c b/drivers/gpu/drm/amd/pm/swsmu/smu11/sienna_cichlid_ppt.c
index fa3842f460fc..0600befc6e4c 100644
--- a/drivers/gpu/drm/amd/pm/swsmu/smu11/sienna_cichlid_ppt.c
+++ b/drivers/gpu/drm/amd/pm/swsmu/smu11/sienna_cichlid_ppt.c
@@ -2279,7 +2279,6 @@ static void sienna_cichlid_dump_pptable(struct smu_context *smu)
 	dev_info(smu->adev->dev, "SkuReserved[5] = 0x%x\n", pptable->SkuReserved[5]);
 	dev_info(smu->adev->dev, "SkuReserved[6] = 0x%x\n", pptable->SkuReserved[6]);
 	dev_info(smu->adev->dev, "SkuReserved[7] = 0x%x\n", pptable->SkuReserved[7]);
-	dev_info(smu->adev->dev, "SkuReserved[8] = 0x%x\n", pptable->SkuReserved[8]);
 
 	dev_info(smu->adev->dev, "GamingClk[0] = 0x%x\n", pptable->GamingClk[0]);
 	dev_info(smu->adev->dev, "GamingClk[1] = 0x%x\n", pptable->GamingClk[1]);
-- 
2.27.0