| Message ID | 20220120213131.GA32119@embeddedor |
|---|---|
| State | New |
| Headers | show |
| Series | [next] USB: serial: ti_usb_3410_5052: Use struct_size() helper in ti_write_byte() | expand |
On Thu, Jan 20, 2022 at 03:31:31PM -0600, Gustavo A. R. Silva wrote: > Make use of the struct_size() helper instead of an open-coded version, > in order to avoid any potential type mistakes or integer overflows that, > in the worst scenario, could lead to heap overflows. > > Also, address the following sparse warnings: > drivers/usb/serial/ti_usb_3410_5052.c:1521:16: warning: using sizeof on a flexible structure > > Link: https://github.com/KSPP/linux/issues/174 > Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org> Looks good. Reviewed-by: Kees Cook <keescook@chromium.org>
diff --git a/drivers/usb/serial/ti_usb_3410_5052.c b/drivers/usb/serial/ti_usb_3410_5052.c index 18c0bd853392..03f98e61626f 100644 --- a/drivers/usb/serial/ti_usb_3410_5052.c +++ b/drivers/usb/serial/ti_usb_3410_5052.c @@ -1512,13 +1512,13 @@ static int ti_write_byte(struct usb_serial_port *port, u8 mask, u8 byte) { int status; - unsigned int size; + size_t size; struct ti_write_data_bytes *data; dev_dbg(&port->dev, "%s - addr 0x%08lX, mask 0x%02X, byte 0x%02X\n", __func__, addr, mask, byte); - size = sizeof(struct ti_write_data_bytes) + 2; + size = struct_size(data, bData, 2); data = kmalloc(size, GFP_KERNEL); if (!data) return -ENOMEM;
Make use of the struct_size() helper instead of an open-coded version, in order to avoid any potential type mistakes or integer overflows that, in the worst scenario, could lead to heap overflows. Also, address the following sparse warnings: drivers/usb/serial/ti_usb_3410_5052.c:1521:16: warning: using sizeof on a flexible structure Link: https://github.com/KSPP/linux/issues/174 Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org> --- drivers/usb/serial/ti_usb_3410_5052.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)