2022-04-14 14:34:20

by baihaowen

Subject: [PATCH] Staging: rtl8192u: Fix signedness bug in ieee80211_check_auth_response()

function ieee80211_check_auth_response () unsigned errcode receive auth_parse()'s
errcode -ENOMEM.

Signed-off-by: Haowen Bai <[email protected]>
---
drivers/staging/rtl8192u/ieee80211/ieee80211_softmac.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/rtl8192u/ieee80211/ieee80211_softmac.c b/drivers/staging/rtl8192u/ieee80211/ieee80211_softmac.c
index 1a43979939a8..4d060c3ec077 100644
--- a/drivers/staging/rtl8192u/ieee80211/ieee80211_softmac.c
+++ b/drivers/staging/rtl8192u/ieee80211/ieee80211_softmac.c
@@ -1461,7 +1461,7 @@ void ieee80211_softmac_check_all_nets(struct ieee80211_device *ieee)
spin_unlock_irqrestore(&ieee->lock, flags);
}

-static inline u16 auth_parse(struct sk_buff *skb, u8 **challenge, int *chlen)
+static inline s16 auth_parse(struct sk_buff *skb, u8 **challenge, int *chlen)
{
struct ieee80211_authentication *a;
u8 *t;
@@ -1826,7 +1826,7 @@ static void ieee80211_check_auth_response(struct ieee80211_device *ieee,
{
/* default support N mode, disable halfNmode */
bool bSupportNmode = true, bHalfSupportNmode = false;
- u16 errcode;
+ s16 errcode;
u8 *challenge;
int chlen = 0;
u32 iotAction;
--
2.7.4

2022-04-15 19:09:41

by Dan Carpenter

Subject: Re: [PATCH] Staging: rtl8192u: Fix signedness bug in ieee80211_check_auth_response()

On Thu, Apr 14, 2022 at 06:32:12PM +0800, Haowen Bai wrote:
> function ieee80211_check_auth_response () unsigned errcode receive auth_parse()'s
> errcode -ENOMEM.
>
> Signed-off-by: Haowen Bai <[email protected]>
> ---
> drivers/staging/rtl8192u/ieee80211/ieee80211_softmac.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/staging/rtl8192u/ieee80211/ieee80211_softmac.c b/drivers/staging/rtl8192u/ieee80211/ieee80211_softmac.c
> index 1a43979939a8..4d060c3ec077 100644
> --- a/drivers/staging/rtl8192u/ieee80211/ieee80211_softmac.c
> +++ b/drivers/staging/rtl8192u/ieee80211/ieee80211_softmac.c
> @@ -1461,7 +1461,7 @@ void ieee80211_softmac_check_all_nets(struct ieee80211_device *ieee)
> spin_unlock_irqrestore(&ieee->lock, flags);
> }
>
> -static inline u16 auth_parse(struct sk_buff *skb, u8 **challenge, int *chlen)
> +static inline s16 auth_parse(struct sk_buff *skb, u8 **challenge, int *chlen)
> {
> struct ieee80211_authentication *a;
> u8 *t;


The auth_parse() function returns 0xcafe on error or else it returns
-ENOMEM or it returns WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG (13). It
returns zero on success. It's a bit silly to return all these random
things. It should only return normal kernel error codes.

If we want we could make it print its own error message:

if (a->status) {
netdev_info(dev, "Authentication response status code 0x%x",
le16_to_cpu(a->status))
return -EINVAL;
}

return 0;

Then delete the printk in the caller or modify it to print an %d instead
of the error code in hex.

regards,
dan carpenter