Re: [PATCH] drm/amdkfd: Check for null pointer after calling kmemdup

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On 2022-01-05 10:56 a.m., Felix Kuehling wrote:
Am 2022-01-05 um 4:09 a.m. schrieb Jiasheng Jiang:
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: 3a87177eb141 ("drm/amdkfd: Add topology support for dGPUs")
Signed-off-by: Jiasheng Jiang <jiasheng@xxxxxxxxxxx>
Reviewed-by: Felix Kuehling <Felix.Kuehling@xxxxxxx>
I applied the patch to amd-staging-drm-next.

Regards,
  Felix



---
  drivers/gpu/drm/amd/amdkfd/kfd_crat.c | 3 +++
  1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_crat.c b/drivers/gpu/drm/amd/amdkfd/kfd_crat.c
index c60e82697385..d15380c65c6d 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_crat.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_crat.c
@@ -410,6 +410,9 @@ 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;



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