package/network/services/hostapd/patches/022-hostapd-fix-use-of-uninitialized-stack-variables.patch

   1 From: Felix Fietkau <nbd@nbd.name>
   2 Date: Thu, 8 Jul 2021 16:33:03 +0200
   3 Subject: [PATCH] hostapd: fix use of uninitialized stack variables
   4
   5 When a CSA is performed on an 80 MHz channel, hostapd_change_config_freq
   6 unconditionally calls hostapd_set_oper_centr_freq_seg0/1_idx with seg0/1
   7 filled by ieee80211_freq_to_chan.
   8 However, if ieee80211_freq_to_chan fails (because the freq is 0 or invalid),
   9 seg0/1 remains uninitialized and filled with stack garbage, causing errors
  10 such as "hostapd: 80 MHz: center segment 1 configured"
  11
  12 Signed-off-by: Felix Fietkau <nbd@nbd.name>
  13 ---
  14
  15 --- a/src/ap/hostapd.c
  16 +++ b/src/ap/hostapd.c
  17 @@ -3453,7 +3453,7 @@ static int hostapd_change_config_freq(st
  18                                       struct hostapd_freq_params *old_params)
  19  {
  20         int channel;
  21 -       u8 seg0, seg1;
  22 +       u8 seg0 = 0, seg1 = 0;
  23         struct hostapd_hw_modes *mode;
  24
  25         if (!params->channel) {