From: Larry Finger Larry.Finger@lwfinger.net
commit 23954cb078febfc63a755301fe77e06bccdb4d2a 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 554c0a3abf216 ("staging: 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 ("staging: Add rtl8723bs sdio wifi driver"). Signed-off-by: Larry Finger Larry.Finger@lwfinger.net Link: https://lore.kernel.org/r/20200210180235.21691-5-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 @@ -3400,7 +3400,7 @@ static int wpa_supplicant_ioctl(struct n
/* down(&ieee->wx_sem); */
- if (p->length < sizeof(struct ieee_param) || !p->pointer) { + if (!p->pointer || p->length != sizeof(struct ieee_param)) { ret = -EINVAL; goto out; }