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drm/amdgpu: debugfs: fix error codes in write functions

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There are two error code bugs here.  The copy_to/from_user() functions
return the number of bytes remaining (a positive number).  We should
return -EFAULT if the copy fails.

Second if we fail because "context.resp_status" is non-zero then return
-EINVAL instead of zero.

Fixes: e50d9ba0d2 ("drm/amdgpu: Add debugfs TA load/unload/invoke support")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Dan Carpenter 2022-04-26 11:48:03 +03:00 • committed by Alex Deucher
parent a6f2e0d9fe
commit a52ad5b6ce
1 changed files with 14 additions and 6 deletions
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20
drivers/gpu/drm/amd/amdgpu/amdgpu_psp_ta.c
View file

@ -159,9 +159,10 @@ static ssize_t ta_if_load_debugfs_write(struct file *fp, const char *buf, size_t
ta_bin = kzalloc(ta_bin_len, GFP_KERNEL);
if (!ta_bin)
ret = -ENOMEM;
ret = copy_from_user((void *)ta_bin, &buf[copy_pos], ta_bin_len);
if (ret)
if (copy_from_user((void *)ta_bin, &buf[copy_pos], ta_bin_len)) {
ret = -EFAULT;
goto err_free_bin;
}
ret = psp_ras_terminate(psp);
if (ret) {
@ -180,11 +181,14 @@ static ssize_t ta_if_load_debugfs_write(struct file *fp, const char *buf, size_t
if (ret || context.resp_status) {
dev_err(adev->dev, "TA load via debugfs failed (%d) status %d\n",
ret, context.resp_status);
if (!ret)
ret = -EINVAL;
goto err_free_bin;
}
context.initialized = true;
ret = copy_to_user((char *)buf, (void *)&context.session_id, sizeof(uint32_t));
if (copy_to_user((char *)buf, (void *)&context.session_id, sizeof(uint32_t)))
ret = -EFAULT;
err_free_bin:
kfree(ta_bin);
@ -251,9 +255,10 @@ static ssize_t ta_if_invoke_debugfs_write(struct file *fp, const char *buf, size
shared_buf = kzalloc(shared_buf_len, GFP_KERNEL);
if (!shared_buf)
ret = -ENOMEM;
ret = copy_from_user((void *)shared_buf, &buf[copy_pos], shared_buf_len);
if (ret)
if (copy_from_user((void *)shared_buf, &buf[copy_pos], shared_buf_len)) {
ret = -EFAULT;
goto err_free_shared_buf;
}
context.session_id = ta_id;
@ -264,10 +269,13 @@ static ssize_t ta_if_invoke_debugfs_write(struct file *fp, const char *buf, size
if (ret || context.resp_status) {
dev_err(adev->dev, "TA invoke via debugfs failed (%d) status %d\n",
ret, context.resp_status);
if (!ret)
ret = -EINVAL;
goto err_free_ta_shared_buf;
}
ret = copy_to_user((char *)buf, context.mem_context.shared_buf, shared_buf_len);
if (copy_to_user((char *)buf, context.mem_context.shared_buf, shared_buf_len))
ret = -EFAULT;
err_free_ta_shared_buf:
psp_ta_free_shared_buf(&context.mem_context);