linux-kernel - [PATCH 5.4 1/1] drm/amdkfd: Check for null pointer after calling kmemdup

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Message-Id: <20230104175155.1415258-2-dragos.panait@windriver.com>
Date:   Wed,  4 Jan 2023 19:51:55 +0200
From:   Dragos-Marian Panait <dragos.panait@...driver.com>
To:     stable@...r.kernel.org
Cc:     Jiasheng Jiang <jiasheng@...as.ac.cn>,
        Felix Kuehling <Felix.Kuehling@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Oded Gabbay <oded.gabbay@...il.com>,
        Christian König <christian.koenig@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Kent Russell <kent.russell@....com>,
        Harish Kasiviswanathan <Harish.Kasiviswanathan@....com>,
        Ben Goz <ben.goz@....com>, dri-devel@...ts.freedesktop.org,
        amd-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH 5.4 1/1] drm/amdkfd: Check for null pointer after calling kmemdup

From: Jiasheng Jiang <jiasheng@...as.ac.cn>

[ Upstream commit 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: 3a87177eb141 ("drm/amdkfd: Add topology support for dGPUs")
Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
Reviewed-by: Felix Kuehling <Felix.Kuehling@....com>
Signed-off-by: Felix Kuehling <Felix.Kuehling@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Dragos-Marian Panait <dragos.panait@...driver.com>
---
 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 3685e89415d5..6066cd7a9d8c 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_crat.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_crat.c
@@ -407,6 +407,9 @@ 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;
-- 
2.38.1