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; }