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| author |   Johan Hovold <johan@kernel.org> | 2018-08-21 11:59:52 +0200 |
|---|---|---|
| committer | Johan Hovold <johan@kernel.org> | 2018-08-27 11:52:34 +0200 |
| commit | 691a03cfe8ca483f9c48153b869d354e4ae3abef (patch) | |
| tree | c33b63b76c28aada7b5367cc12440234b6ca488f /drivers/usb | |
| parent | Linux 4.19-rc1 (diff) | |
| download | linux-dev-691a03cfe8ca483f9c48153b869d354e4ae3abef.tar.xz linux-dev-691a03cfe8ca483f9c48153b869d354e4ae3abef.zip | |
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: 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>
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/serial/io_ti.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/usb/serial/io_ti.h b/drivers/usb/serial/io_ti.h index e53c68261017..9bbcee37524e 100644 --- a/drivers/usb/serial/io_ti.h +++ b/drivers/usb/serial/io_ti.h @@ -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 |