From: Greg Kroah-Hartman gregkh@linuxfoundation.org
From: Dan Carpenter dan.carpenter@oracle.com
commit d660f4f42ccea50262c6ee90c8e7ad19a69fb225 upstream.
The memdup_user() function does not necessarily return a NUL terminated string so this can lead to a read overflow. Switch from memdup_user() to strndup_user() to fix this bug.
Fixes: c6dc001f2add ("staging: r8712u: Merging Realtek's latest (v2.6.6). Various fixes.") Cc: stable stable@vger.kernel.org Signed-off-by: Dan Carpenter dan.carpenter@oracle.com Link: https://lore.kernel.org/r/YDYSR+1rj26NRhvb@mwanda Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/staging/rtl8712/rtl871x_ioctl_linux.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/staging/rtl8712/rtl871x_ioctl_linux.c +++ b/drivers/staging/rtl8712/rtl871x_ioctl_linux.c @@ -927,7 +927,7 @@ static int r871x_wx_set_priv(struct net_ struct iw_point *dwrq = (struct iw_point *)awrq;
len = dwrq->length; - ext = memdup_user(dwrq->pointer, len); + ext = strndup_user(dwrq->pointer, len); if (IS_ERR(ext)) return PTR_ERR(ext);