4.4-stable review patch. If anyone has any objections, please let me know.
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From: Johan Hovold johan@kernel.org
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
--- drivers/usb/serial/io_ti.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/usb/serial/io_ti.h +++ b/drivers/usb/serial/io_ti.h @@ -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