From 84b435b38a84c9a7e8ba33e8d02d2f967f847ce1 Mon Sep 17 00:00:00 2001 From: Gabor Juhos Date: Tue, 11 Dec 2012 14:15:53 +0100 Subject: [PATCH 1/3] rt2x00: zero-out rx_status In commit 'mac80211: support radiotap vendor namespace RX data' new fields were added to 'struct ieee80211_rx_status'. The rt2x00 driver does not initializes those fields and this can cause unexpected behaviour. The rt2x00 driver from the compat-wireless-2012-12-01 tarball caused the following warning: WARNING: at /devel/ramips/build_dir/target-mipsel_r2_uClibc-0.9.33.2/linux-ramips_rt305x/ compat-wireless-2012-12-01/net/mac80211/rx.c:115 ieee80211_rx_irqsafe+0x274/0xbcc [mac80211]() Modules linked in: dwc_otg ledtrig_usbdev nf_nat_irc nf_nat_ftp nf_conntrack_irc nf_conntrack_ftp ipt_MASQUERADE iptable_nat nf_nat pppoe xt_conntrack xt_CT xt_NOTRACK iptable_raw xt_state nf_conntrack_ipv4 nf_defrag_ipv4 nf_conntrack pppox ipt_REJECT xt_TCPMSS xt_comment xt_multiport xt_mac xt_limit iptable_mangle iptable_filter ip_tables xt_tcpudp x_tables ppp_async ppp_generic slhc rt2800pci(O) rt2800lib(O) rt2x00soc(O) rt2x00pci(O) rt2x00lib(O) mac80211(O) usbcore usb_common nls_base crc_itu_t crc_ccitt eeprom_93cx6 cfg80211(O) compat(O) arc4 aes_generic crypto_blkcipher cryptomgr aead crypto_hash crypto_algapi leds_gpio button_hotplug(O) gpio_keys_polled input_polldev input_core Call Trace: [<801e96b4>] dump_stack+0x8/0x34 [<80010a9c>] warn_slowpath_common+0x78/0xa4 [<80010ae0>] warn_slowpath_null+0x18/0x24 [<80a9710c>] ieee80211_rx_irqsafe+0x274/0xbcc [mac80211] The patch ensures that each field gets initialized with zeroes. Cc: Signed-off-by: Gabor Juhos --- drivers/net/wireless/rt2x00/rt2x00dev.c | 2 ++ 1 file changed, 2 insertions(+) --- a/drivers/net/wireless/rt2x00/rt2x00dev.c +++ b/drivers/net/wireless/rt2x00/rt2x00dev.c @@ -685,6 +685,8 @@ void rt2x00lib_rxdone(struct queue_entry * to mac80211. */ rx_status = IEEE80211_SKB_RXCB(entry->skb); + memset(rx_status, 0, sizeof(*rx_status)); + rx_status->mactime = rxdesc.timestamp; rx_status->band = rt2x00dev->curr_band; rx_status->freq = rt2x00dev->curr_freq;