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[PATCH 4.9 027/103] mwifiex: debugfs: Fix (sometimes) off-by-1 SSID print

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4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Brian Norris <briannorris@chromium.org>

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@chromium.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 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);

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[PATCH 4.9 000/103] 4.9.28-stable review Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-05-11 17:20 +0200
  [PATCH 4.9 016/103] power: supply: bq24190_charger: Install irq_handler_thread() at end of probe() Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-05-11 17:20 +0200
  [PATCH 4.9 027/103] mwifiex: debugfs: Fix (sometimes) off-by-1 SSID print Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-05-11 17:20 +0200
  [PATCH 4.9 048/103] x86/platform/intel-mid: Correct MSI IRQ line for watchdog device Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-05-11 17:20 +0200
  [PATCH 4.9 002/103] drm/sti: fix GDP size to support up to UHD resolution Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-05-11 17:20 +0200
  [PATCH 4.9 008/103] cpupower: Fix turbo frequency reporting for pre-Sandy Bridge cores Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-05-11 17:20 +0200
  [PATCH 4.9 052/103] usb: dwc2: host: use msleep() for long delay Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-05-11 17:20 +0200
  [PATCH 4.9 020/103] arm64: dts: r8a7795: Mark EthernetAVB device node disabled Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-05-11 17:20 +0200
  [PATCH 4.9 017/103] power: supply: bq24190_charger: Call power_supply_changed() for relevant component Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-05-11 17:20 +0200
  [PATCH 4.9 019/103] power: supply: bq24190_charger: Handle fault before status on interrupt Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-05-11 17:20 +0200
  [PATCH 4.9 001/103] 9p: fix a potential acl leak Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-05-11 17:20 +0200
  [PATCH 4.9 011/103] powerpc/ftrace: Fix confusing help text for DISABLE_MPROFILE_KERNEL Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-05-11 17:20 +0200
  [PATCH 4.9 009/103] powerpc/mm: Fixup wrong LPCR_VRMASD value Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-05-11 17:20 +0200
  Re: [PATCH 4.9 000/103] 4.9.28-stable review Guenter Roeck <linux@roeck-us.net> - 2017-05-11 23:10 +0200
    Re: [PATCH 4.9 000/103] 4.9.28-stable review Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-05-12 08:30 +0200
  Re: [PATCH 4.9 000/103] 4.9.28-stable review Shuah Khan <shuahkh@osg.samsung.com> - 2017-05-12 17:30 +0200
  Re: [PATCH 4.9 000/103] 4.9.28-stable review Guenter Roeck <linux@roeck-us.net> - 2017-05-13 04:50 +0200

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