From: Emmanuel Grumbach Date: Mon, 3 Dec 2018 19:16:07 +0000 (+0200) Subject: mac80211: ignore NullFunc frames in the duplicate detection X-Git-Tag: rel_imx_4.19.35_1.1.0~7938 X-Git-Url: https://git.somdevices.com/?a=commitdiff_plain;h=b74a078e48a9b142312b3fa1a41b2f4e6cfbebac;p=linux.git mac80211: ignore NullFunc frames in the duplicate detection commit 990d71846a0b7281bd933c34d734e6afc7408e7e upstream. NullFunc packets should never be duplicate just like QoS-NullFunc packets. We saw a client that enters / exits power save with NullFunc frames (and not with QoS-NullFunc) despite the fact that the association supports HT. This specific client also re-uses a non-zero sequence number for different NullFunc frames. At some point, the client had to send a retransmission of the NullFunc frame and we dropped it, leading to a misalignment in the power save state. Fix this by never consider a NullFunc frame as duplicate, just like we do for QoS NullFunc frames. This fixes https://bugzilla.kernel.org/show_bug.cgi?id=201449 CC: Signed-off-by: Emmanuel Grumbach Signed-off-by: Johannes Berg Signed-off-by: Greg Kroah-Hartman --- diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c index 5ac7a0a49916..5e2b4a41acf1 100644 --- a/net/mac80211/rx.c +++ b/net/mac80211/rx.c @@ -1372,6 +1372,7 @@ ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx) return RX_CONTINUE; if (ieee80211_is_ctl(hdr->frame_control) || + ieee80211_is_nullfunc(hdr->frame_control) || ieee80211_is_qos_nullfunc(hdr->frame_control) || is_multicast_ether_addr(hdr->addr1)) return RX_CONTINUE;