From: Larry Finger Larry.Finger@lwfinger.net
commit 499c405b2b80bb3a04425ba3541d20305e014d3e 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 a2c60d42d97c ("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: a2c60d42d97c ("staging: r8188eu: Add files for new driver - part 16") Signed-off-by: Larry Finger Larry.Finger@lwfinger.net Link: https://lore.kernel.org/r/20200210180235.21691-2-Larry.Finger@lwfinger.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/staging/rtl8188eu/os_dep/ioctl_linux.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/staging/rtl8188eu/os_dep/ioctl_linux.c +++ b/drivers/staging/rtl8188eu/os_dep/ioctl_linux.c @@ -2856,7 +2856,7 @@ static int rtw_hostapd_ioctl(struct net_ goto out; }
- if (!p->pointer) { + if (!p->pointer || p->length != sizeof(struct ieee_param)) { ret = -EINVAL; goto out; }