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| author | Johannes Berg <johannes.berg@intel.com> | 2021-05-11 20:02:48 +0200 |
|---|---|---|
| committer | Johannes Berg <johannes.berg@intel.com> | 2021-05-11 20:13:45 +0200 |
| commit | bf30ca922a0c0176007e074b0acc77ed345e9990 (patch) | |
| tree | a641f6bf65a98f802e6f0f8f8374b4d1ca89930d /net/mac80211/rx.c | |
| parent | 3a11ce08c45b50d69c891d71760b7c5b92074709 (diff) | |
| download | linux-stable-bf30ca922a0c0176007e074b0acc77ed345e9990.tar.gz linux-stable-bf30ca922a0c0176007e074b0acc77ed345e9990.tar.bz2 linux-stable-bf30ca922a0c0176007e074b0acc77ed345e9990.zip | |
mac80211: check defrag PN against current frame
As pointed out by Mathy Vanhoef, we implement the RX PN check
on fragmented frames incorrectly - we check against the last
received PN prior to the new frame, rather than to the one in
this frame itself.
Prior patches addressed the security issue here, but in order
to be able to reason better about the code, fix it to really
compare against the current frame's PN, not the last stored
one.
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20210511200110.bfbc340ff071.Id0b690e581da7d03d76df90bb0e3fd55930bc8a0@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/mac80211/rx.c')
| -rw-r--r-- | net/mac80211/rx.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c index 7212a1bebd0c..b619c47e1d12 100644 --- a/net/mac80211/rx.c +++ b/net/mac80211/rx.c @@ -2308,7 +2308,6 @@ ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx) if (entry->check_sequential_pn) { int i; u8 pn[IEEE80211_CCMP_PN_LEN], *rpn; - int queue; if (!requires_sequential_pn(rx, fc)) return RX_DROP_UNUSABLE; @@ -2323,8 +2322,8 @@ ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx) if (pn[i]) break; } - queue = rx->security_idx; - rpn = rx->key->u.ccmp.rx_pn[queue]; + + rpn = rx->ccm_gcm.pn; if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN)) return RX_DROP_UNUSABLE; memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN); |