linux-kernel - [PATCH v2 1/2] clk:Fix divide-by-zero in divider_ro_round_rate

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <1553913085-51237-1-git-send-email-nixiaoming@huawei.com>
Date:   Sat, 30 Mar 2019 10:31:25 +0800
From:   nixiaoming <nixiaoming@...wei.com>
To:     <jbrunet@...libre.com>, <mturquette@...libre.com>,
        <sboyd@...eaurora.org>, <soren.brinkmann@...inx.com>,
        <nixiaoming@...wei.com>, <mojha@...eaurora.org>
CC:     <linux-clk@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v2 1/2] clk:Fix divide-by-zero in divider_ro_round_rate_parent

In the function divider_recalc_rate() The judgment of the return value of
_get_div() indicates that the return value of _get_div() may be 0.
In order to avoid the divide-by-zero error, add check the return value
of _get_div() in the divider_ro_round_rate_parent()

Signed-off-by: nixiaoming <nixiaoming@...wei.com>
---
 drivers/clk/clk-divider.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/clk/clk-divider.c b/drivers/clk/clk-divider.c
index e5a1726..f4bf7a4 100644
--- a/drivers/clk/clk-divider.c
+++ b/drivers/clk/clk-divider.c
@@ -347,6 +347,9 @@ long divider_ro_round_rate_parent(struct clk_hw *hw, struct clk_hw *parent,
 	int div;
 
 	div = _get_div(table, val, flags, width);
+	/* avoid divide-by-zero */
+	if (!div)
+		return -EINVAL;
 
 	/* Even a read-only clock can propagate a rate change */
 	if (clk_hw_get_flags(hw) & CLK_SET_RATE_PARENT) {
-- 
1.8.5.6