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ath9k: fix tx99 potential info leak

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[ Upstream commit ee0a47186e2fa9aa1c56cadcea470ca0ba8c8692 ]

When the user sets count to zero the string buffer would remain
completely uninitialized which causes the kernel to parse its
own stack data, potentially leading to an info leak. In addition
to that, the string might be not terminated properly when the
user data does not contain a 0-terminator.

Signed-off-by: Miaoqing Pan <miaoqing@codeaurora.org>
Reviewed-by: Christoph Böhmwalder <christoph@boehmwalder.at>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Miaoqing Pan 2017-09-27 09:13:34 +08:00 committed by Greg Kroah-Hartman
parent 8f23eb16af
commit ed70a22125
1 changed files with 5 additions and 0 deletions
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5
drivers/net/wireless/ath/ath9k/tx99.c
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@ -179,6 +179,9 @@ static ssize_t write_file_tx99(struct file *file, const char __user *user_buf,
ssize_t len;
int r;
if (count < 1)
return -EINVAL;
if (sc->cur_chan->nvifs > 1)
return -EOPNOTSUPP;
@ -186,6 +189,8 @@ static ssize_t write_file_tx99(struct file *file, const char __user *user_buf,
if (copy_from_user(buf, user_buf, len))
return -EFAULT;
buf[len] = '\0';
if (strtobool(buf, &start))
return -EINVAL;