From: Larry Finger
> Sent: 20 August 2018 18:51
> When strncpy() is called with source and destination strings the same
> length, gcc 8 warns that there may be an unterminated string. Using
> strlcpy() rather than strncpy() forces a null at the end and quiets the
> warning.
>
> Signed-off-by: Larry Finger <Larry.Finger@xxxxxxxxxxxx>
> ---
> drivers/staging/rtl8192e/rtllib_softmac.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/staging/rtl8192e/rtllib_softmac.c b/drivers/staging/rtl8192e/rtllib_softmac.c
> index 919231fec09c..95a8390cb7ac 100644
> --- a/drivers/staging/rtl8192e/rtllib_softmac.c
> +++ b/drivers/staging/rtl8192e/rtllib_softmac.c
> @@ -1684,14 +1684,14 @@ inline void rtllib_softmac_new_net(struct rtllib_device *ieee,
> * essid provided by the user.
> */
> if (!ssidbroad) {
> - strncpy(tmp_ssid, ieee->current_network.ssid,
> + strlcpy(tmp_ssid, ieee->current_network.ssid,
> IW_ESSID_MAX_SIZE);
> tmp_ssid_len = ieee->current_network.ssid_len;
If there is a length, why not use it?
Depending on where the data came from the length might need validating.
Depending on how tmp_ssid is used it might need zero filling.
> }
> memcpy(&ieee->current_network, net,
> sizeof(struct rtllib_network));
Gah - should be sizeof(ieee->current_network).
Or better still a structure assignment.
> if (!ssidbroad) {
> - strncpy(ieee->current_network.ssid, tmp_ssid,
> + strlcpy(ieee->current_network.ssid, tmp_ssid,
> IW_ESSID_MAX_SIZE);
> ieee->current_network.ssid_len = tmp_ssid_len;
Hmmm... this looks like it is restoring the fields.
So why not have a temporary ssid buffer that is the size of the
actual buffer and user memcpy().
David
-
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Registration No: 1397386 (Wales)
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