This is a note to let you know that I've just added the patch titled
drm/amdgpu: Fix potential double free and null pointer dereference
to the 6.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-amdgpu-fix-potential-double-free-and-null-pointe.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 8badab2c68dbd636a52cb44d50c0d6a39453ce94
Author: Liang He <windhl@xxxxxxx>
Date: Tue Nov 22 12:28:49 2022 +0800
drm/amdgpu: Fix potential double free and null pointer dereference
[ Upstream commit dfd0287bd3920e132a8dae2a0ec3d92eaff5f2dd ]
In amdgpu_get_xgmi_hive(), we should not call kfree() after
kobject_put() as the PUT will call kfree().
In amdgpu_device_ip_init(), we need to check the returned *hive*
which can be NULL before we dereference it.
Signed-off-by: Liang He <windhl@xxxxxxx>
Reviewed-by: Luben Tuikov <luben.tuikov@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 2cf72cfa2e60..913f22d41673 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -2462,6 +2462,11 @@ static int amdgpu_device_ip_init(struct amdgpu_device *adev)
if (!amdgpu_sriov_vf(adev)) {
struct amdgpu_hive_info *hive = amdgpu_get_xgmi_hive(adev);
+ if (WARN_ON(!hive)) {
+ r = -ENOENT;
+ goto init_failed;
+ }
+
if (!hive->reset_domain ||
!amdgpu_reset_get_reset_domain(hive->reset_domain)) {
r = -ENOENT;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c
index 47159e9a0884..4b9e7b050ccd 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c
@@ -386,7 +386,6 @@ struct amdgpu_hive_info *amdgpu_get_xgmi_hive(struct amdgpu_device *adev)
if (ret) {
dev_err(adev->dev, "XGMI: failed initializing kobject for xgmi hive\n");
kobject_put(&hive->kobj);
- kfree(hive);
hive = NULL;
goto pro_end;
}
@@ -410,7 +409,6 @@ struct amdgpu_hive_info *amdgpu_get_xgmi_hive(struct amdgpu_device *adev)
dev_err(adev->dev, "XGMI: failed initializing reset domain for xgmi hive\n");
ret = -ENOMEM;
kobject_put(&hive->kobj);
- kfree(hive);
hive = NULL;
goto pro_end;
}
