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

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: 1da177e4c3 ("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>
This commit is contained in:
Johan Hovold 2018-08-21 11:59:52 +02:00
parent 5b394b2ddf
commit 691a03cfe8
1 changed files with 1 additions and 1 deletions
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2
drivers/usb/serial/io_ti.h
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@ -173,7 +173,7 @@ 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