linux-kernel - [PATCH AUTOSEL 6.6 07/20] drm/admgpu: fix dereferencing null pointer context

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Message-ID: <20240728154605.2048490-7-sashal@kernel.org>
Date: Sun, 28 Jul 2024 11:45:05 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Jesse Zhang <jesse.zhang@....com>,
	Jesse Zhang <Jesse.Zhang@....com>,
	Tim Huang <Tim.Huang@....com>,
	Alex Deucher <alexander.deucher@....com>,
	Sasha Levin <sashal@...nel.org>,
	christian.koenig@....com,
	Xinhui.Pan@....com,
	airlied@...il.com,
	daniel@...ll.ch,
	Hawking.Zhang@....com,
	Stanley.Yang@....com,
	amd-gfx@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 6.6 07/20] drm/admgpu: fix dereferencing null pointer context

From: Jesse Zhang <jesse.zhang@....com>

[ Upstream commit 030ffd4d43b433bc6671d9ec34fc12c59220b95d ]

When user space sets an invalid ta type, the pointer context will be empty.
So it need to check the pointer context before using it

Signed-off-by: Jesse Zhang <Jesse.Zhang@....com>
Suggested-by: Tim Huang <Tim.Huang@....com>
Reviewed-by: Tim Huang <Tim.Huang@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_psp_ta.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_psp_ta.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_psp_ta.c
index ca5c86e5f7cd6..8e8afbd237bcd 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_psp_ta.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_psp_ta.c
@@ -334,7 +334,7 @@ static ssize_t ta_if_invoke_debugfs_write(struct file *fp, const char *buf, size
 
 	set_ta_context_funcs(psp, ta_type, &context);
 
-	if (!context->initialized) {
+	if (!context || !context->initialized) {
 		dev_err(adev->dev, "TA is not initialized\n");
 		ret = -EINVAL;
 		goto err_free_shared_buf;
-- 
2.43.0