diff options
| author | Johan Hovold <jhovold@gmail.com> | 2013-04-16 20:01:22 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-04-17 21:05:34 +0400 |
| commit | a6c042f95031afbeb0b0fb77643bc9211a3f2e2e (patch) | |
| tree | 8ba25be6478d618d1cfd5ae7c2e3a6375909a191 /drivers/usb/serial/omninet.c | |
| parent | d91641b161594672242b3c5d8656ad3b2ef58f34 (diff) | |
| download | linux-a6c042f95031afbeb0b0fb77643bc9211a3f2e2e.tar.xz | |
USB: omninet: refactor read-urb processing
Refactor read-urb processing, and add sanity checks on header and data
lengths.
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/serial/omninet.c')
| -rw-r--r-- | drivers/usb/serial/omninet.c | 25 |
1 files changed, 18 insertions, 7 deletions
diff --git a/drivers/usb/serial/omninet.c b/drivers/usb/serial/omninet.c index 9dcaa7727de5..7aaf9692b334 100644 --- a/drivers/usb/serial/omninet.c +++ b/drivers/usb/serial/omninet.c @@ -158,11 +158,26 @@ static void omninet_close(struct usb_serial_port *port) #define OMNINET_BULKOUTSIZE 64 #define OMNINET_PAYLOADSIZE (OMNINET_BULKOUTSIZE - OMNINET_HEADERLEN) +static void omninet_process_read_urb(struct urb *urb) +{ + struct usb_serial_port *port = urb->context; + const struct omninet_header *hdr = urb->transfer_buffer; + const unsigned char *data; + size_t data_len; + + if (urb->actual_length <= OMNINET_HEADERLEN || !hdr->oh_len) + return; + + data = (char *)urb->transfer_buffer + OMNINET_HEADERLEN; + data_len = min_t(size_t, urb->actual_length - OMNINET_HEADERLEN, + hdr->oh_len); + tty_insert_flip_string(&port->port, data, data_len); + tty_flip_buffer_push(&port->port); +} + static void omninet_read_bulk_callback(struct urb *urb) { struct usb_serial_port *port = urb->context; - unsigned char *data = urb->transfer_buffer; - struct omninet_header *header = (struct omninet_header *) &data[0]; int status = urb->status; int result; @@ -172,11 +187,7 @@ static void omninet_read_bulk_callback(struct urb *urb) return; } - if (urb->actual_length && header->oh_len) { - tty_insert_flip_string(&port->port, data + OMNINET_HEADERLEN, - header->oh_len); - tty_flip_buffer_push(&port->port); - } + omninet_process_read_urb(urb); /* Continue trying to always read */ result = usb_submit_urb(urb, GFP_ATOMIC); |