staging: ozwpan: prevent overflow in oz_cdev_write()

commit c2c65cd2e14ada6de44cb527e7f1990bede24e15 upstream.

We need to check "count" so we don't overflow the ei->data buffer.

Reported-by: Nico Golde <nico@ngolde.de>
Reported-by: Fabian Yamaguchi <fabs@goesec.de>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/ozwpan/ozcdev.c b/drivers/staging/ozwpan/ozcdev.c
index 27d06666c81ab4ce12aab8b15ddf79884ee72e3e..224ccff75d4fc1dd1faf979bd03e8d55ae21022a 100644 (file)
--- a/drivers/staging/ozwpan/ozcdev.c
+++ b/drivers/staging/ozwpan/ozcdev.c
@@ -153,6 +153,9 @@ static ssize_t oz_cdev_write(struct file *filp, const char __user *buf,
        struct oz_app_hdr *app_hdr;
        struct oz_serial_ctx *ctx;
 
+       if (count > sizeof(ei->data) - sizeof(*elt) - sizeof(*app_hdr))
+               return -EINVAL;
+
        spin_lock_bh(&g_cdev.lock);
        pd = g_cdev.active_pd;
        if (pd)