From: Johannes Berg johannes.berg@intel.com

The length check here was bad, if the length doesn't at least include the length of the fixed part, we cannot call ieee80211_he_oper_size() to determine the total. Fix this, and convert to cfg80211_find_ext_elem() while at it.

Cc: stable@vger.kernel.org Fixes: 70debba3ab7d ("mac80211: save HE oper info in BSS config for mesh") Signed-off-by: Johannes Berg johannes.berg@intel.com --- net/mac80211/mesh.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/net/mac80211/mesh.c b/net/mac80211/mesh.c index a4212a333d61..15ac08d111ea 100644 --- a/net/mac80211/mesh.c +++ b/net/mac80211/mesh.c @@ -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 =