linux-kernel - [PATCH] drm/amdkfd: Fix missing check in kfd_parse_subtype

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Date:   Tue, 14 Dec 2021 14:48:23 +0000
From:   Miaoqian Lin <linmq006@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     linmq006@...il.com, Felix Kuehling <Felix.Kuehling@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH] drm/amdkfd: Fix missing check in kfd_parse_subtype_iolink

The kmemdup() function may return NULL in case of error.
Add NULL checking to prevent potential null deference.

Signed-off-by: Miaoqian Lin <linmq006@...il.com>
---
 drivers/gpu/drm/amd/amdkfd/kfd_crat.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_crat.c b/drivers/gpu/drm/amd/amdkfd/kfd_crat.c
index cfedfb1e8596..59d55f752aa7 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_crat.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_crat.c
@@ -1060,6 +1060,8 @@ 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;
-- 
2.17.1