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Date: Thu, 9 Sep 2021 01:01:00 -0400
From: Felix Kuehling <felix.kuehling@....com>
To: Xiyu Yang <xiyuyang19@...an.edu.cn>,
Alex Deucher <alexander.deucher@....com>,
Christian König <christian.koenig@....com>,
"Pan, Xinhui" <Xinhui.Pan@....com>,
David Airlie <airlied@...ux.ie>,
Daniel Vetter <daniel@...ll.ch>, amd-gfx@...ts.freedesktop.org,
dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Cc: yuanxzhang@...an.edu.cn, Xin Xiong <xiongx18@...an.edu.cn>,
Xin Tan <tanxin.ctf@...il.com>
Subject: Re: [PATCH] drm/amd/amdkfd: fix possible memory leak in
svm_range_restore_pages
Hi Xiyu Yang,
This bug was already fixed by this commit:
https://gitlab.freedesktop.org/agd5f/linux/-/commit/598a118db0d85a432f8cd541a6a5d31e31c56b6b
Regards,
Felix
Am 2021-09-09 um 12:27 a.m. schrieb Xiyu Yang:
> The memory leak issue may take place in an error handling path. When
> p->xnack_enabled is NULL, the function simply returns with -EFAULT and
> forgets to decrement the reference count of a kfd_process object bumped
> by kfd_lookup_process_by_pasid, which may incur memory leaks.
>
> Fix it by jumping to label "out", in which kfd_unref_process() decreases
> the refcount.
>
> Signed-off-by: Xiyu Yang <xiyuyang19@...an.edu.cn>
> Signed-off-by: Xin Xiong <xiongx18@...an.edu.cn>
> Signed-off-by: Xin Tan <tanxin.ctf@...il.com>
> ---
> drivers/gpu/drm/amd/amdkfd/kfd_svm.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
> index e883731c3f8f..0f7f1e5621ea 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
> @@ -2426,7 +2426,8 @@ svm_range_restore_pages(struct amdgpu_device *adev, unsigned int pasid,
> }
> if (!p->xnack_enabled) {
> pr_debug("XNACK not enabled for pasid 0x%x\n", pasid);
> - return -EFAULT;
> + r = -EFAULT;
> + goto out;
> }
> svms = &p->svms;
>
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