On 09.05.2018 22:17, Ajay Singh wrote:
> On Wed, 9 May 2018 16:42:59 +0300
> Claudiu Beznea <[email protected]> wrote:
>
>> On 07.05.2018 11:43, Ajay Singh wrote:
>>> Use kmemdup instead of kmalloc & memcpy in add_network_to_shadow().
>>>
>>> Signed-off-by: Ajay Singh <[email protected]>
>>> ---
>>> drivers/staging/wilc1000/wilc_wfi_cfgoperations.c | 4 ++--
>>> 1 file changed, 2 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/drivers/staging/wilc1000/wilc_wfi_cfgoperations.c
>>> b/drivers/staging/wilc1000/wilc_wfi_cfgoperations.c index
>>> 0ae2065..ca221f1 100644 ---
>>> a/drivers/staging/wilc1000/wilc_wfi_cfgoperations.c +++
>>> b/drivers/staging/wilc1000/wilc_wfi_cfgoperations.c @@ -331,8
>>> +331,8 @@ static void add_network_to_shadow(struct network_info
>>> *nw_info, shadow_nw_info->tsf_hi = nw_info->tsf_hi; if (ap_found !=
>>> -1) kfree(shadow_nw_info->ies);
>>> - shadow_nw_info->ies = kmalloc(nw_info->ies_len,
>>> GFP_KERNEL);
>>> - memcpy(shadow_nw_info->ies, nw_info->ies,
>>> nw_info->ies_len);
>>> + shadow_nw_info->ies = kmemdup(nw_info->ies,
>>> nw_info->ies_len,
>>> + GFP_KERNEL);
>>
>> Maybe, in case of NULL, you will want to set ies_len = 0 ?
>
>
> I couldn't find code where 'ies_len' is check to validity of data.
> Mostly we use NULL check for "ies" pointer for data
> validity.So in my opinion setting it to zero would be
> irrelevant.
I'm seeing this in refresh_scan():
network_info = &last_scanned_shadow[i];
if (!memcmp("DIRECT-", network_info->ssid, 7) && !direct_scan)
continue;
freq = ieee80211_channel_to_frequency((s32)network_info->ch,
NL80211_BAND_2GHZ);
channel = ieee80211_get_channel(wiphy, freq);
rssi = get_rssi_avg(network_info);
bss = cfg80211_inform_bss(wiphy,
channel,
CFG80211_BSS_FTYPE_UNKNOWN,
network_info->bssid,
network_info->tsf_hi,
network_info->cap_info,
network_info->beacon_period,
(const u8 *)network_info->ies,
(size_t)network_info->ies_len,
(s32)rssi * 100,
GFP_KERNEL);
Looking further into cfg80211_inform_bss():
-> cfg80211_inform_bss_data()
-> cfg80211_get_bss_channel()
-> cfg80211_find_ie()
-> cfg80211_find_ie_match():
while (len >= 2 && len >= ies[1] + 2) {
if ((ies[0] == eid) &&
(ies[1] + 2 >= match_offset + match_len) &&
!memcmp(ies + match_offset, match, match_len))
return ies;
len -= ies[1] + 2;
ies += ies[1] + 2;
}
>
>
>>
>>> shadow_nw_info->time_scan = jiffies;
>>> shadow_nw_info->time_scan_cached = jiffies;
>>> shadow_nw_info->found = 1;
>>>
>
>
> Regards,
> Ajay
>
>
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