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| author | Johan Hovold <johan@kernel.org> | 2018-07-04 18:02:17 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-07-17 12:39:26 +0300 |
| commit | 82b9cb4d3f062aa80f15a4f2a2f567b93e2d0739 (patch) | |
| tree | 53e97222b893cd0de74eaa59b73c9d1e9d53dbdf | |
| parent | 90f2a76ccd37cce2530df49335bcea6cd0e23797 (diff) | |
| download | linux-82b9cb4d3f062aa80f15a4f2a2f567b93e2d0739.tar.xz | |
USB: serial: mos7840: fix status-register error handling
commit 794744abfffef8b1f3c0c8a4896177d6d13d653d upstream.
Add missing transfer-length sanity check to the status-register
completion handler to avoid leaking bits of uninitialised slab data to
user space.
Fixes: 3f5429746d91 ("USB: Moschip 7840 USB-Serial Driver")
Cc: stable <stable@vger.kernel.org> # 2.6.19
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/usb/serial/mos7840.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/usb/serial/mos7840.c b/drivers/usb/serial/mos7840.c index e8669aae14b3..5e490177cf75 100644 --- a/drivers/usb/serial/mos7840.c +++ b/drivers/usb/serial/mos7840.c @@ -481,6 +481,9 @@ static void mos7840_control_callback(struct urb *urb) } dev_dbg(dev, "%s urb buffer size is %d\n", __func__, urb->actual_length); + if (urb->actual_length < 1) + goto out; + dev_dbg(dev, "%s mos7840_port->MsrLsr is %d port %d\n", __func__, mos7840_port->MsrLsr, mos7840_port->port_num); data = urb->transfer_buffer; |