linux-kernel - [PATCH 5.11 239/342] power: supply: cpcap-battery: fix invalid usage of list cursor

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Date:   Mon, 10 May 2021 12:20:29 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Guangqing Zhu <zhuguangqing83@...il.com>,
        Tony Lindgren <tony@...mide.com>,
        Carl Philipp Klemm <philipp@...s.xyz>,
        Sebastian Reichel <sebastian.reichel@...labora.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.11 239/342] power: supply: cpcap-battery: fix invalid usage of list cursor

From: Guangqing Zhu <zhuguangqing83@...il.com>

[ Upstream commit d0a43c12ee9f57ddb284272187bd18726c2c2c98 ]

Fix invalid usage of a list_for_each_entry in cpcap_battery_irq_thread().
Empty list or fully traversed list points to list head, which is not
NULL (and before the first element containing real data).

Signed-off-by: Guangqing Zhu <zhuguangqing83@...il.com>
Reviewed-by: Tony Lindgren <tony@...mide.com>
Reviewed-by: Carl Philipp Klemm <philipp@...s.xyz>
Tested-by: Carl Philipp Klemm <philipp@...s.xyz>
Signed-off-by: Sebastian Reichel <sebastian.reichel@...labora.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/power/supply/cpcap-battery.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/power/supply/cpcap-battery.c b/drivers/power/supply/cpcap-battery.c
index cebc5c8fda1b..793d4ca52f8a 100644
--- a/drivers/power/supply/cpcap-battery.c
+++ b/drivers/power/supply/cpcap-battery.c
@@ -626,7 +626,7 @@ static irqreturn_t cpcap_battery_irq_thread(int irq, void *data)
 			break;
 	}
 
-	if (!d)
+	if (list_entry_is_head(d, &ddata->irq_list, node))
 		return IRQ_NONE;
 
 	latest = cpcap_battery_latest(ddata);
-- 
2.30.2