[PATCH AUTOSEL 6.7 52/58] drm/amdgpu: Fix shared buff copy to user

Sasha Levin
2024-02-13T00:20:13Z

From: "Stanley.Yang" <Stanley.Yang@amd.com>

[ Upstream commit 2dcf82a8e8dc930655787797ef8a3692b527c7a9 ]

ta if invoke node buffer
|-------- ta type ----------|
|-------- ta id ----------|
|-------- cmd id ----------|
|------ shared buf len -----|
|------ shared buffer ------|

ta if invoke node buffer is as above, copy shared buffer data to correct location

Signed-off-by: Stanley.Yang <Stanley.Yang@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.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 468a67b302d4..ca5c86e5f7cd 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_psp_ta.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_psp_ta.c
@@ -362,7 +362,7 @@ static ssize_t ta_if_invoke_debugfs_write(struct file *fp, const char *buf, size
}
}

- if (copy_to_user((char *)buf, context->mem_context.shared_buf, shared_buf_len))
+ if (copy_to_user((char *)&buf[copy_pos], context->mem_context.shared_buf, shared_buf_len))
ret = -EFAULT;

err_free_shared_buf:
--
2.43.0