* [PATCH] drm/amdgpu: ensure device_list is initialised before calling list_add_tail
@ 2020-04-10 22:57 Colin King
2020-04-11 4:42 ` Andrey Grodzovsky
0 siblings, 1 reply; 2+ messages in thread
From: Colin King @ 2020-04-10 22:57 UTC (permalink / raw)
To: Alex Deucher, Christian König, David Zhou, David Airlie,
Daniel Vetter, John Clements, amd-gfx, dri-devel
Cc: kernel-janitors, linux-kernel
From: Colin Ian King <colin.king@canonical.com>
Currently the call to list_add_tail will access an the uninitalised
device_list.prev. Fix this by ensuring device_list is initialized before
adding items to it.
Addresses-Coverity: ("Uninitialized pointer read")
Fixes: b3dbd6d3ec49 ("drm/amdgpu: resolve mGPU RAS query instability")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
index b0aa4e1ed4df..caa4969bd46f 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
@@ -1447,6 +1447,7 @@ static void amdgpu_ras_do_recovery(struct work_struct *work)
if (hive && adev->gmc.xgmi.num_physical_nodes > 1) {
device_list_handle = &hive->device_list;
} else {
+ INIT_LIST_HEAD(&device_list);
list_add_tail(&adev->gmc.xgmi.head, &device_list);
device_list_handle = &device_list;
}
--
2.25.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] drm/amdgpu: ensure device_list is initialised before calling list_add_tail
2020-04-10 22:57 [PATCH] drm/amdgpu: ensure device_list is initialised before calling list_add_tail Colin King
@ 2020-04-11 4:42 ` Andrey Grodzovsky
0 siblings, 0 replies; 2+ messages in thread
From: Andrey Grodzovsky @ 2020-04-11 4:42 UTC (permalink / raw)
To: Colin King, Alex Deucher, Christian König, David Zhou,
David Airlie, Daniel Vetter, John Clements, amd-gfx, dri-devel
Cc: kernel-janitors, linux-kernel
On 4/10/20 6:57 PM, Colin King wrote:
> From: Colin Ian King <colin.king@canonical.com>
>
> Currently the call to list_add_tail will access an the uninitalised
> device_list.prev. Fix this by ensuring device_list is initialized before
> adding items to it.
>
> Addresses-Coverity: ("Uninitialized pointer read")
That weird, I see that his is already initialized unconditionally here -
https://elixir.bootlin.com/linux/v5.6.3/source/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c#L4022
Andrey
> Fixes: b3dbd6d3ec49 ("drm/amdgpu: resolve mGPU RAS query instability")
> Signed-off-by: Colin Ian King <colin.king@canonical.com>
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
> index b0aa4e1ed4df..caa4969bd46f 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
> @@ -1447,6 +1447,7 @@ static void amdgpu_ras_do_recovery(struct work_struct *work)
> if (hive && adev->gmc.xgmi.num_physical_nodes > 1) {
> device_list_handle = &hive->device_list;
> } else {
> + INIT_LIST_HEAD(&device_list);
> list_add_tail(&adev->gmc.xgmi.head, &device_list);
> device_list_handle = &device_list;
> }
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2020-04-11 4:43 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-04-10 22:57 [PATCH] drm/amdgpu: ensure device_list is initialised before calling list_add_tail Colin King
2020-04-11 4:42 ` Andrey Grodzovsky
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).