diff options
| author | Dan Carpenter <dan.carpenter@oracle.com> | 2022-05-17 14:48:44 +0300 |
|---|---|---|
| committer | Kalle Valo <kvalo@kernel.org> | 2022-05-30 14:17:26 +0300 |
| commit | b88d28146c30a8e14f0f012d56ebf19b68a348f4 (patch) | |
| tree | b9f66765613d44372060821166570861116df871 /drivers/net/wireless/realtek/rtlwifi | |
| parent | 89d8f53ff6e729907af77f09f48eca9854295c91 (diff) | |
| download | linux-b88d28146c30a8e14f0f012d56ebf19b68a348f4.tar.xz | |
wifi: rtlwifi: fix error codes in rtl_debugfs_set_write_h2c()
If the copy_from_user() fails or the user gives invalid date then the
correct thing to do is to return a negative error code. (Currently it
returns success).
I made a copy additional related cleanups:
1) There is no need to check "buffer" for NULL. That's handled by
copy_from_user().
2) The "h2c_len" variable cannot be negative because it is unsigned
and because sscanf() does not return negative error codes.
Fixes: 610247f46feb ("rtlwifi: Improve debugging by using debugfs")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/YoOLnDkHgVltyXK7@kili
Diffstat (limited to 'drivers/net/wireless/realtek/rtlwifi')
| -rw-r--r-- | drivers/net/wireless/realtek/rtlwifi/debug.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/net/wireless/realtek/rtlwifi/debug.c b/drivers/net/wireless/realtek/rtlwifi/debug.c index 901cdfe3723c..0b1bc04cb6ad 100644 --- a/drivers/net/wireless/realtek/rtlwifi/debug.c +++ b/drivers/net/wireless/realtek/rtlwifi/debug.c @@ -329,8 +329,8 @@ static ssize_t rtl_debugfs_set_write_h2c(struct file *filp, tmp_len = (count > sizeof(tmp) - 1 ? sizeof(tmp) - 1 : count); - if (!buffer || copy_from_user(tmp, buffer, tmp_len)) - return count; + if (copy_from_user(tmp, buffer, tmp_len)) + return -EFAULT; tmp[tmp_len] = '\0'; @@ -340,8 +340,8 @@ static ssize_t rtl_debugfs_set_write_h2c(struct file *filp, &h2c_data[4], &h2c_data[5], &h2c_data[6], &h2c_data[7]); - if (h2c_len <= 0) - return count; + if (h2c_len == 0) + return -EINVAL; for (i = 0; i < h2c_len; i++) h2c_data_packed[i] = (u8)h2c_data[i]; |