6.12-stable review patch. If anyone has any objections, please let me know.
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From: Johannes Berg johannes.berg@intel.com
[ Upstream commit 130067e9c13bdc4820748ef16076a6972364745f ]
If there's any vendor-specific element in the subelements then the outer element parsing must not parse any vendor element at all. This isn't implemented correctly now due to parsing into the pointers and then overriding them, so explicitly skip vendor elements if any exist in the sub- elements (non-transmitted profile or per-STA profile).
Fixes: 671042a4fb77 ("mac80211: support non-inheritance element") Reviewed-by: Ilan Peer ilan.peer@intel.com Reviewed-by: Miriam Rachel Korenblit miriam.rachel.korenblit@intel.com Link: https://patch.msgid.link/20250221112451.fd71e5268840.I9db3e6a3367e6ff38d052d... Signed-off-by: Johannes Berg johannes.berg@intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- net/mac80211/parse.c | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/net/mac80211/parse.c b/net/mac80211/parse.c index 3d5d6658fe8d5..6da39c864f45b 100644 --- a/net/mac80211/parse.c +++ b/net/mac80211/parse.c @@ -48,6 +48,7 @@ struct ieee80211_elems_parse { const struct element *ml_epcs_elem;
bool multi_link_inner; + bool skip_vendor;
/* * scratch buffer that can be used for various element parsing related @@ -400,6 +401,9 @@ _ieee802_11_parse_elems_full(struct ieee80211_elems_parse_params *params, IEEE80211_PARSE_ERR_BAD_ELEM_SIZE; break; case WLAN_EID_VENDOR_SPECIFIC: + if (elems_parse->skip_vendor) + break; + if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 && pos[2] == 0xf2) { /* Microsoft OUI (00:50:F2) */ @@ -1054,12 +1058,16 @@ ieee802_11_parse_elems_full(struct ieee80211_elems_parse_params *params) multi_link_inner = true; }
+ elems_parse->skip_vendor = + cfg80211_find_elem(WLAN_EID_VENDOR_SPECIFIC, + sub.start, sub.len); elems->crc = _ieee802_11_parse_elems_full(params, elems_parse, non_inherit);
/* Override with nontransmitted/per-STA profile if found */ if (sub.len) { elems_parse->multi_link_inner = multi_link_inner; + elems_parse->skip_vendor = false; _ieee802_11_parse_elems_full(&sub, elems_parse, NULL); }