linux-kernel - [PATCH v3] drm/amdgpu: off by one in amdgpu_device_attr_create

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Message-ID: <20200520152556.GQ3041@kadam>
Date:   Wed, 20 May 2020 18:25:56 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Alex Deucher <alexander.deucher@....com>,
        Kevin Wang <kevin1.wang@....com>,
        "Ruhl, Michael J" <michael.j.ruhl@...el.com>
Cc:     Christian König <christian.koenig@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, Evan Quan <evan.quan@....com>,
        Rui Huang <ray.huang@....com>,
        Kenneth Feng <kenneth.feng@....com>,
        Yintian Tao <yttao@....com>,
        Hawking Zhang <Hawking.Zhang@....com>,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH v3] drm/amdgpu: off by one in
 amdgpu_device_attr_create_groups() error handling

This loop in the error handling code should start a "i - 1" and end at
"i == 0".  Currently it starts a "i" and ends at "i == 1".  The result
is that it removes one attribute that wasn't created yet, and leaks the
zeroeth attribute.

Fixes: 4e01847c38f7 ("drm/amdgpu: optimize amdgpu device attribute code")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
---
v2: style change
v3: Fix embarrassing typo in the subject

 drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c           | 3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
index b75362bf0742..e809534fabd4 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
@@ -1942,9 +1942,8 @@ static int amdgpu_device_attr_create_groups(struct amdgpu_device *adev,
 	return 0;
 
 failed:
-	for (; i > 0; i--) {
+	while (i--)
 		amdgpu_device_attr_remove(adev, &attrs[i]);
-	}
 
 	return ret;
 }