On Thu, 10 May 2018 08:35:29 +0300
Claudiu Beznea <Claudiu.Beznea@xxxxxxxxxxxxx> wrote:
> On 09.05.2018 22:17, Ajay Singh wrote:
> > On Wed, 9 May 2018 16:42:59 +0300
> > Claudiu Beznea <Claudiu.Beznea@xxxxxxxxxxxxx> 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 <ajay.kathat@xxxxxxxxxxxxx>
> >>> ---
> >>> 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;
> }
>
>
Got it. I will also include the code to set ies_len to 0 during
memory allocations failure scenario.
> >
> >
> >>
> >>> shadow_nw_info->time_scan = jiffies;
> >>> shadow_nw_info->time_scan_cached = jiffies;
> >>> shadow_nw_info->found = 1;
> >>>
> >
> >
> > Regards,
> > Ajay
> >
> >
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