mwifiex: debugfs: Fix (sometimes) off-by-1 SSID print

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>

diff --git a/drivers/net/wireless/mwifiex/debugfs.c b/drivers/net/wireless/mwifiex/debugfs.c
index 2713f7acd35e6d45081482c36b983a8a92af89a3..4775b66d87b2cbfbd6177ddefd1ae1fc8b520ecb 100644 (file)
--- a/drivers/net/wireless/mwifiex/debugfs.c
+++ b/drivers/net/wireless/mwifiex/debugfs.c
@@ -220,7 +220,8 @@ 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);