From 8eda10eaa18709e951b5d5fbbf673543365a4455 Mon Sep 17 00:00:00 2001 From: Avinash Patil Date: Wed, 17 Sep 2014 23:01:26 +0530 Subject: [PATCH] mwifiex: ensure user_scan_in not NULL while setting scan channel gap Check for scan channel gap only when user_scan_in is not NULL. user_scan_in is NULL for internal scans and if we check scan channel gap at this place, it may result into crash. Reported-by: Dan Carpenter Signed-off-by: Avinash Patil Signed-off-by: Cathy Luo Signed-off-by: John W. Linville --- drivers/net/wireless/mwifiex/scan.c | 33 +++++++++++++++++---------------- 1 file changed, 17 insertions(+), 16 deletions(-) diff --git a/drivers/net/wireless/mwifiex/scan.c b/drivers/net/wireless/mwifiex/scan.c index c09ebee..ca64d4c 100644 --- a/drivers/net/wireless/mwifiex/scan.c +++ b/drivers/net/wireless/mwifiex/scan.c @@ -926,6 +926,23 @@ mwifiex_config_scan(struct mwifiex_private *priv, if ((i && ssid_filter) || !is_zero_ether_addr(scan_cfg_out->specific_bssid)) *filtered_scan = true; + + if (user_scan_in->scan_chan_gap) { + dev_dbg(adapter->dev, "info: scan: channel gap = %d\n", + user_scan_in->scan_chan_gap); + *max_chan_per_scan = + MWIFIEX_MAX_CHANNELS_PER_SPECIFIC_SCAN; + + chan_gap_tlv = (void *)tlv_pos; + chan_gap_tlv->header.type = + cpu_to_le16(TLV_TYPE_SCAN_CHANNEL_GAP); + chan_gap_tlv->header.len = + cpu_to_le16(sizeof(chan_gap_tlv->chan_gap)); + chan_gap_tlv->chan_gap = + cpu_to_le16((user_scan_in->scan_chan_gap)); + tlv_pos += + sizeof(struct mwifiex_ie_types_scan_chan_gap); + } } else { scan_cfg_out->bss_mode = (u8) adapter->scan_mode; num_probes = adapter->scan_probes; @@ -940,22 +957,6 @@ mwifiex_config_scan(struct mwifiex_private *priv, else *max_chan_per_scan = MWIFIEX_DEF_CHANNELS_PER_SCAN_CMD; - if (user_scan_in->scan_chan_gap) { - *max_chan_per_scan = MWIFIEX_MAX_CHANNELS_PER_SPECIFIC_SCAN; - dev_dbg(adapter->dev, "info: scan: channel gap = %d\n", - user_scan_in->scan_chan_gap); - - chan_gap_tlv = (void *)tlv_pos; - chan_gap_tlv->header.type = - cpu_to_le16(TLV_TYPE_SCAN_CHANNEL_GAP); - chan_gap_tlv->header.len = - cpu_to_le16(sizeof(chan_gap_tlv->chan_gap)); - chan_gap_tlv->chan_gap = - cpu_to_le16((user_scan_in->scan_chan_gap)); - - tlv_pos += sizeof(struct mwifiex_ie_types_scan_chan_gap); - } - /* If the input config or adapter has the number of Probes set, add tlv */ if (num_probes) { -- 2.7.4