Unverified Commit 334c97d1 authored by openeuler-ci-bot's avatar openeuler-ci-bot Committed by Gitee
Browse files

!11266 serial: core: check uartclk for zero to avoid divide by zero 

Merge Pull Request from: @ci-robot 
 
PR sync from: Yi Yang <yiyang13@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/HT4UHDXBRJFMW24YPRSXV7BOX67QUPE5/ 
 
https://gitee.com/src-openeuler/kernel/issues/IAMM8U 
 
Link:https://gitee.com/openeuler/kernel/pulls/11266

 

Reviewed-by: default avatarLiu YongQiang <liuyongqiang13@huawei.com>
Signed-off-by: default avatarZhang Changzhong <zhangchangzhong@huawei.com>
parents 0ced0bec 45b8fbbd

drivers/tty/serial/serial_core.c

+8 −0
Original line number Diff line number Diff line
@@ -850,6 +850,14 @@ static int uart_set_info(struct tty_struct *tty, struct tty_port *port, 
	new_flags = (__force upf_t)new_info->flags;

	old_custom_divisor = uport->custom_divisor;



	if (!(uport->flags & UPF_FIXED_PORT)) {

		unsigned int uartclk = new_info->baud_base * 16;

		/* check needs to be done here before other settings made */

		if (uartclk == 0) {

			retval = -EINVAL;

			goto exit;

		}

	}

	if (!capable(CAP_SYS_ADMIN)) {

		retval = -EPERM;

		if (change_irq || change_port ||