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USB: serial: mos7840: fix status-register error handling

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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>
This commit is contained in:
Johan Hovold 2018-07-04 17:02:17 +02:00
parent 01b3cdfca2
commit 794744abff
1 changed files with 3 additions and 0 deletions
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3
drivers/usb/serial/mos7840.c
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@ -468,6 +468,9 @@ 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;