drm/amdkfd: Check for null pointer after calling kmemdup

stable inclusion
from stable-v6.0.14
commit abfaf0ee
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/I6694U
CVE: CVE-2022-3108

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=abfaf0eee97925905e742aa3b0b72e04a918fa9e

--------------------------------

As the possible failure of the allocation, kmemdup() may return NULL
pointer.
Therefore, it should be better to check the 'props2' in order to prevent
the dereference of NULL pointer.

Fixes: 3a87177e ("drm/amdkfd: Add topology support for dGPUs")
Signed-off-by: NJiasheng Jiang <jiasheng@iscas.ac.cn>
Reviewed-by: NFelix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: NFelix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: NRen Zhijie <renzhijie2@huawei.com>
Reviewed-by: Nsongping yu <yusongping@huawei.com>
Reviewed-by: NChen Hui <judy.chenhui@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

drivers/gpu/drm/amd/amdkfd/kfd_crat.c

@@ -408,6 +408,9 @@ static int kfd_parse_subtype_iolink(struct crat_subtype_iolink *iolink,
 			return -ENODEV;
 		/* same everything but the other direction */
 		props2 = kmemdup(props, sizeof(*props2), GFP_KERNEL);
+		if (!props2)
+			return -ENOMEM;
+
 		props2->node_from = id_to;
 		props2->node_to = id_from;
 		props2->kobj = NULL;