diff options
| author | Yi Yang <yiyang13@huawei.com> | 2022-06-28 16:35:15 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-07-21 20:40:33 +0200 |
| commit | f7a4aabcb3aced96d7ae4c82222b9739bb979a74 (patch) | |
| tree | fa87c6ecf0563cde61a4b0ecbde27d29573ed795 | |
| parent | b0b882a42380bd4e55e16c618823c97fbd750c40 (diff) | |
serial: 8250: fix return error code in serial8250_request_std_resource()
commit 6e690d54cfa802f939cefbd2fa2c91bd0b8bd1b6 upstream.
If port->mapbase = NULL in serial8250_request_std_resource() , it need
return a error code instead of 0. If uart_set_info() fail to request new
regions by serial8250_request_std_resource() but the return value of
serial8250_request_std_resource() is 0, The system incorrectly considers
that the resource application is successful and does not attempt to
restore the old setting. A null pointer reference is triggered when the
port resource is later invoked.
Signed-off-by: Yi Yang <yiyang13@huawei.com>
Cc: stable <stable@kernel.org>
Link: https://lore.kernel.org/r/20220628083515.64138-1-yiyang13@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/tty/serial/8250/8250_port.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c index d3f17b23ac61..d337a6d02282 100644 --- a/drivers/tty/serial/8250/8250_port.c +++ b/drivers/tty/serial/8250/8250_port.c @@ -2789,8 +2789,10 @@ static int serial8250_request_std_resource(struct uart_8250_port *up) case UPIO_MEM32BE: case UPIO_MEM16: case UPIO_MEM: - if (!port->mapbase) + if (!port->mapbase) { + ret = -EINVAL; break; + } if (!request_mem_region(port->mapbase, size, "serial")) { ret = -EBUSY; |