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Two small fixes:

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* RCU misuse in scan processing in cfg80211
  * missing size check for HE data in mac80211 mesh
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Merge tag 'mac80211-for-net-2021-10-21' of git://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211

Johannes Berg says:

====================
Two small fixes:
 * RCU misuse in scan processing in cfg80211
 * missing size check for HE data in mac80211 mesh

* tag 'mac80211-for-net-2021-10-21' of git://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211:
  cfg80211: scan: fix RCU in cfg80211_add_nontrans_list()
  mac80211: mesh: fix HE operation element length check
====================

Link: https://lore.kernel.org/r/20211021154351.134297-1-johannes@sipsolutions.net
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jakub Kicinski 2021-10-22 11:12:45 -07:00
commit 7fcb1c950e
2 changed files with 10 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
net/mac80211/mesh.c
View File

@ -672,7 +672,7 @@ ieee80211_mesh_update_bss_params(struct ieee80211_sub_if_data *sdata,
u8 *ie, u8 ie_len)
{
struct ieee80211_supported_band *sband;
const u8 *cap;
const struct element *cap;
const struct ieee80211_he_operation *he_oper = NULL;
sband = ieee80211_get_sband(sdata);
@ -687,9 +687,10 @@ ieee80211_mesh_update_bss_params(struct ieee80211_sub_if_data *sdata,
sdata->vif.bss_conf.he_support = true;
cap = cfg80211_find_ext_ie(WLAN_EID_EXT_HE_OPERATION, ie, ie_len);
if (cap && cap[1] >= ieee80211_he_oper_size(&cap[3]))
he_oper = (void *)(cap + 3);
cap = cfg80211_find_ext_elem(WLAN_EID_EXT_HE_OPERATION, ie, ie_len);
if (cap && cap->datalen >= 1 + sizeof(*he_oper) &&
cap->datalen >= 1 + ieee80211_he_oper_size(cap->data + 1))
he_oper = (void *)(cap->data + 1);
if (he_oper)
sdata->vif.bss_conf.he_oper.params =

7
net/wireless/scan.c
View File

@ -418,14 +418,17 @@ cfg80211_add_nontrans_list(struct cfg80211_bss *trans_bss,
}
ssid_len = ssid[1];
ssid = ssid + 2;
rcu_read_unlock();
/* check if nontrans_bss is in the list */
list_for_each_entry(bss, &trans_bss->nontrans_list, nontrans_list) {
if (is_bss(bss, nontrans_bss->bssid, ssid, ssid_len))
if (is_bss(bss, nontrans_bss->bssid, ssid, ssid_len)) {
rcu_read_unlock();
return 0;
}
}
rcu_read_unlock();
/* add to the list */
list_add_tail(&nontrans_bss->nontrans_list, &trans_bss->nontrans_list);
return 0;