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USB: serial: ti_usb_3410_5052: fix array underflow in completion handler

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commit 5dfdd24eb3d39d815bc952ae98128e967c9bba49 upstream.

Similarly to a recently reported bug in io_ti, a malicious USB device
could set port_number to a negative value and we would underflow the
port array in the interrupt completion handler.

As these devices only have one or two ports, fix this by making sure we
only consider the seventh bit when determining the port number (and
ignore bits 0xb0 which are typically set to 0x30).

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2018-08-21 11:59:53 +02:00 committed by Greg Kroah-Hartman
parent 86312d58a9
commit 8b97b2ec36
1 changed files with 1 additions and 1 deletions
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2
drivers/usb/serial/ti_usb_3410_5052.h
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@ -227,7 +227,7 @@ struct ti_interrupt {
} __attribute__((packed));
/* Interrupt codes */
#define TI_GET_PORT_FROM_CODE(c) (((c) >> 4) - 3)
#define TI_GET_PORT_FROM_CODE(c) (((c) >> 6) & 0x01)
#define TI_GET_FUNC_FROM_CODE(c) ((c) & 0x0f)
#define TI_CODE_HARDWARE_ERROR 0xFF
#define TI_CODE_DATA_ERROR 0x03