This is a note to let you know that I've just added the patch titled mwifiex: debugfs: Fix (sometimes) off-by-1 SSID print to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: mwifiex-debugfs-fix-sometimes-off-by-1-ssid-print.patch and it can be found in the queue-4.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 6183468a23fc6b6903f8597982017ad2c7fdefcf Mon Sep 17 00:00:00 2001 From: Brian Norris <briannorris@xxxxxxxxxxxx> Date: Mon, 9 Jan 2017 15:33:50 -0800 Subject: mwifiex: debugfs: Fix (sometimes) off-by-1 SSID print From: Brian Norris <briannorris@xxxxxxxxxxxx> commit 6183468a23fc6b6903f8597982017ad2c7fdefcf upstream. 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 <briannorris@xxxxxxxxxxxx> Signed-off-by: Kalle Valo <kvalo@xxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/net/wireless/marvell/mwifiex/debugfs.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- 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, cha 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); Patches currently in stable-queue which might be from briannorris@xxxxxxxxxxxx are queue-4.9/mwifiex-debugfs-fix-sometimes-off-by-1-ssid-print.patch