From: Larry Finger Larry.Finger@lwfinger.net
commit ac33597c0c0d1d819dccfe001bcd0acef7107e7c upstream.
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 554c0a3abf216 ("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 554c0a3abf216 ("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
--- drivers/staging/rtl8723bs/os_dep/ioctl_linux.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/staging/rtl8723bs/os_dep/ioctl_linux.c +++ b/drivers/staging/rtl8723bs/os_dep/ioctl_linux.c @@ -4236,7 +4236,7 @@ static int rtw_hostapd_ioctl(struct net_
/* if (p->length < sizeof(struct ieee_param) || !p->pointer) { */ - if (!p->pointer) { + if (!p->pointer || p->length != sizeof(*param)) { ret = -EINVAL; goto out; }