Commit a5a09b34 authored by Brian Norris's avatar Brian Norris Committed by Sasha Levin

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

[ Upstream commit 6183468a ]

Similar to commit fcd2042e ("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: 5e6e3a92 ("wireless: mwifiex: initial commit for Marvell mwifiex driver")
Signed-off-by: default avatarBrian Norris <briannorris@chromium.org>
Signed-off-by: default avatarKalle Valo <kvalo@codeaurora.org>
Signed-off-by: default avatarSasha Levin <alexander.levin@verizon.com>
parent 039747b6
......@@ -115,7 +115,8 @@ 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);
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment