From 08c75d4b76828479d220958ba8eb4bfaadbd0a71 Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Thu, 8 Apr 2021 14:31:50 +0200 Subject: [PATCH] mac80211: bail out if cipher schemes are invalid [ Upstream commit db878e27a98106a70315d264cc92230d84009e72 ] If any of the cipher schemes specified by the driver are invalid, bail out and fail the registration rather than just warning. Otherwise, we might later crash when we try to use the invalid cipher scheme, e.g. if the hdr_len is (significantly) less than the pn_offs + pn_len, we'd have an out-of-bounds access in RX validation. Fixes: 2475b1cc0d52 ("mac80211: add generic cipher scheme support") Link: https://lore.kernel.org/r/20210408143149.38a3a13a1b19.I6b7f5790fa0958ed8049cf02ac2a535c61e9bc96@changeid Signed-off-by: Johannes Berg Signed-off-by: Sasha Levin --- net/mac80211/main.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/net/mac80211/main.c b/net/mac80211/main.c index 19c093bb3876..73893025922f 100644 --- a/net/mac80211/main.c +++ b/net/mac80211/main.c @@ -1150,8 +1150,11 @@ int ieee80211_register_hw(struct ieee80211_hw *hw) if (local->hw.wiphy->max_scan_ie_len) local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len; - WARN_ON(!ieee80211_cs_list_valid(local->hw.cipher_schemes, - local->hw.n_cipher_schemes)); + if (WARN_ON(!ieee80211_cs_list_valid(local->hw.cipher_schemes, + local->hw.n_cipher_schemes))) { + result = -EINVAL; + goto fail_workqueue; + } result = ieee80211_init_cipher_suites(local); if (result < 0)