| Message ID | YoOLnDkHgVltyXK7@kili |
|---|---|
| State | New |
| Headers | show |
| Series | rtlwifi: fix error codes in rtl_debugfs_set_write_h2c() | expand |
Dan Carpenter <dan.carpenter@oracle.com> wrote: > 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> Patch applied to wireless-next.git, thanks. b88d28146c30 wifi: rtlwifi: fix error codes in rtl_debugfs_set_write_h2c()
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];
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> --- drivers/net/wireless/realtek/rtlwifi/debug.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)