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qlcnic: replace deprecated strncpy with strscpy

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strncpy() is deprecated for use on NUL-terminated destination strings
[1] and as such we should prefer more robust and less ambiguous string
interfaces.

We expect fw_info->fw_file_name to be NUL-terminated based on its use
within _request_firmware_prepare() wherein `name` refers to it:
|       if (firmware_request_builtin_buf(firmware, name, dbuf, size)) {
|               dev_dbg(device, "using built-in %s\n", name);
|               return 0; /* assigned */
|       }
... and with firmware_request_builtin() also via `name`:
|       if (strcmp(name, b_fw->name) == 0) {

There is no evidence that NUL-padding is required.

Additionally replace size macro (QLC_FW_FILE_NAME_LEN) with
sizeof(fw_info->fw_file_name) to more directly tie the maximum buffer
size to the destination buffer:

Considering the above, a suitable replacement is `strscpy` [2] due to
the fact that it guarantees NUL-termination on the destination buffer
without unnecessarily NUL-padding.

Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1]
Link: https://manpages.debian.org/testing/linux-manual-4.8/strscpy.9.en.html [2]
Link: https://github.com/KSPP/linux/issues/90
Cc: linux-hardening@vger.kernel.org
Signed-off-by: Justin Stitt <justinstitt@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Justin Stitt 2023-12-07 21:42:22 +00:00 • committed by David S. Miller
parent 378bc9a40e
commit f8dd2412ba
1 changed files with 6 additions and 6 deletions
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12
drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_init.c
View file

@ -2092,8 +2092,8 @@ static int qlcnic_83xx_run_post(struct qlcnic_adapter *adapter)
return -EINVAL;
}
strncpy(fw_info->fw_file_name, QLC_83XX_POST_FW_FILE_NAME,
QLC_FW_FILE_NAME_LEN);
strscpy(fw_info->fw_file_name, QLC_83XX_POST_FW_FILE_NAME,
sizeof(fw_info->fw_file_name));
ret = request_firmware(&fw_info->fw, fw_info->fw_file_name, dev);
if (ret) {
@ -2396,12 +2396,12 @@ static int qlcnic_83xx_get_fw_info(struct qlcnic_adapter *adapter)
switch (pdev->device) {
case PCI_DEVICE_ID_QLOGIC_QLE834X:
case PCI_DEVICE_ID_QLOGIC_QLE8830:
strncpy(fw_info->fw_file_name, QLC_83XX_FW_FILE_NAME,
QLC_FW_FILE_NAME_LEN);
strscpy(fw_info->fw_file_name, QLC_83XX_FW_FILE_NAME,
sizeof(fw_info->fw_file_name));
break;
case PCI_DEVICE_ID_QLOGIC_QLE844X:
strncpy(fw_info->fw_file_name, QLC_84XX_FW_FILE_NAME,
QLC_FW_FILE_NAME_LEN);
strscpy(fw_info->fw_file_name, QLC_84XX_FW_FILE_NAME,
sizeof(fw_info->fw_file_name));
break;
default:
dev_err(&pdev->dev, "%s: Invalid device id\n",