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

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Date:   Wed, 20 May 2020 15:31:11 +0000
From:   "Ruhl, Michael J" <michael.j.ruhl@...el.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>,
        Alex Deucher <alexander.deucher@....com>,
        Kevin Wang <kevin1.wang@....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" <amd-gfx@...ts.freedesktop.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>
Subject: RE: [PATCH v3] drm/amdgpu: off by one in
 amdgpu_device_attr_create_groups() error handling

>-----Original Message-----
>From: Dan Carpenter <dan.carpenter@...cle.com>
>Sent: Wednesday, May 20, 2020 11:26 AM
>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

😊

Acked-by: Michael J. Ruhl <michael.j.ruhl@...el.com>

m
> 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;
> }