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staging: rtl8188eu: Fix potential overuse of kernel memory

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commit 4ddf8ab8d1 upstream.

In routine wpa_supplicant_ioctl(), the user-controlled p->length is
checked to be at least the size of struct ieee_param size, but the code
does not detect the case where p->length is greater than the size
of the struct, thus a malicious user could be wasting kernel memory.
Fixes commit a2c60d42d9 ("Add files for new driver - part 16").

Reported by: Pietro Oliva <pietroliva@gmail.com>
Cc: Pietro Oliva <pietroliva@gmail.com>
Cc: Stable <stable@vger.kernel.org>
Fixes commit a2c60d42d9 ("Add files for new driver - part 16").
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Link: https://lore.kernel.org/r/20200210180235.21691-4-Larry.Finger@lwfinger.net
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Larry Finger 2020-02-10 12:02:32 -06:00 committed by Greg Kroah-Hartman
parent ddedb84fcd
commit de63cd8b55
1 changed files with 1 additions and 1 deletions
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2
drivers/staging/rtl8188eu/os_dep/ioctl_linux.c
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@ -2025,7 +2025,7 @@ static int wpa_supplicant_ioctl(struct net_device *dev, struct iw_point *p)
struct ieee_param *param;
uint ret = 0;
if (p->length < sizeof(struct ieee_param) || !p->pointer) {
if (!p->pointer || p->length != sizeof(struct ieee_param)) {
ret = -EINVAL;
goto out;
}