From: Brian Norris Date: Mon, 9 Jan 2017 23:33:50 +0000 (-0800) Subject: mwifiex: debugfs: Fix (sometimes) off-by-1 SSID print X-Git-Tag: v4.11-rc1~124^2~264^2~48 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;ds=sidebyside;h=6183468a23fc6b6903f8597982017ad2c7fdefcf;p=karo-tx-linux.git mwifiex: debugfs: Fix (sometimes) off-by-1 SSID print Similar to commit fcd2042e8d36 ("mwifiex: printk() overflow with 32-byte SSIDs"), we failed to account for the existence of 32-char SSIDs in our debugfs code. Unlike in that case though, we zeroed out the containing struct first, and I'm pretty sure we're guaranteed to have some padding after the 'ssid.ssid' and 'ssid.ssid_len' fields (the struct is 33 bytes long). So, this is the difference between: # cat /sys/kernel/debug/mwifiex/mlan0/info ... essid="0123456789abcdef0123456789abcdef " ... and the correct output: # cat /sys/kernel/debug/mwifiex/mlan0/info ... essid="0123456789abcdef0123456789abcdef" ... Fixes: 5e6e3a92b9a4 ("wireless: mwifiex: initial commit for Marvell mwifiex driver") Signed-off-by: Brian Norris Signed-off-by: Kalle Valo --- diff --git a/drivers/net/wireless/marvell/mwifiex/debugfs.c b/drivers/net/wireless/marvell/mwifiex/debugfs.c index b9284b533294..ae2b69db5994 100644 --- a/drivers/net/wireless/marvell/mwifiex/debugfs.c +++ b/drivers/net/wireless/marvell/mwifiex/debugfs.c @@ -114,7 +114,8 @@ mwifiex_info_read(struct file *file, char __user *ubuf, if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA) { p += sprintf(p, "multicast_count=\"%d\"\n", netdev_mc_count(netdev)); - p += sprintf(p, "essid=\"%s\"\n", info.ssid.ssid); + p += sprintf(p, "essid=\"%.*s\"\n", info.ssid.ssid_len, + info.ssid.ssid); p += sprintf(p, "bssid=\"%pM\"\n", info.bssid); p += sprintf(p, "channel=\"%d\"\n", (int) info.bss_chan); p += sprintf(p, "country_code = \"%s\"\n", info.country_code);