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

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commit 691a03cfe8ca483f9c48153b869d354e4ae3abef upstream.

As reported by Dan Carpenter, 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>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
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 11:59:52 +02:00 committed by Greg Kroah-Hartman
parent f409f34070
commit 403c5c2377
1 changed files with 1 additions and 1 deletions
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2
drivers/usb/serial/io_ti.h
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@ -178,7 +178,7 @@ struct ump_interrupt {
} __attribute__((packed));
#define TIUMP_GET_PORT_FROM_CODE(c) (((c) >> 4) - 3)
#define TIUMP_GET_PORT_FROM_CODE(c) (((c) >> 6) & 0x01)
#define TIUMP_GET_FUNC_FROM_CODE(c) ((c) & 0x0f)
#define TIUMP_INTERRUPT_CODE_LSR 0x03
#define TIUMP_INTERRUPT_CODE_MSR 0x04