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staging: rtl8723bs: Fix potential security hole

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In routine rtw_hostapd_ioctl(), the user-controlled p->length is assumed
to be at least the size of struct ieee_param size, but this assumption is
never checked. This could result in out-of-bounds read/write on kernel
heap in case a p->length less than the size of struct ieee_param is
specified by the user. If p->length is allowed to be greater than the size
of the struct, then a malicious user could be wasting kernel memory.
Fixes commit 554c0a3abf ("0taging: Add rtl8723bs sdio wifi driver").

Reported by: Pietro Oliva <pietroliva@gmail.com>
Cc: Pietro Oliva <pietroliva@gmail.com>
Cc: Stable <stable@vger.kernel.org>
Fixes 554c0a3abf ("0taging: Add rtl8723bs sdio wifi driver").
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Link: https://lore.kernel.org/r/20200210180235.21691-3-Larry.Finger@lwfinger.net
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Larry Finger 2020-02-10 12:02:31 -06:00 committed by Greg Kroah-Hartman
parent 499c405b2b
commit ac33597c0c
1 changed files with 1 additions and 1 deletions
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2
drivers/staging/rtl8723bs/os_dep/ioctl_linux.c
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@ -4207,7 +4207,7 @@ static int rtw_hostapd_ioctl(struct net_device *dev, struct iw_point *p)
/* if (p->length < sizeof(struct ieee_param) || !p->pointer) { */
if (!p->pointer) {
if (!p->pointer || p->length != sizeof(*param)) {
ret = -EINVAL;
goto out;
}