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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Guangqing Zhu <zhuguangqing83@gmail.com>,
        Tony Lindgren <tony@atomide.com>,
        Carl Philipp Klemm <philipp@uvos.xyz>,
        Sebastian Reichel <sebastian.reichel@collabora.com>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.12 270/384] power: supply: cpcap-battery: fix invalid usage of list cursor
Date:   Mon, 10 May 2021 12:20:59 +0200
Message-Id: <20210510102023.743855609@linuxfoundation.org>
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References: <20210510102014.849075526@linuxfoundation.org>
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From: Guangqing Zhu <zhuguangqing83@gmail.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@gmail.com>
Reviewed-by: Tony Lindgren <tony@atomide.com>
Reviewed-by: Carl Philipp Klemm <philipp@uvos.xyz>
Tested-by: Carl Philipp Klemm <philipp@uvos.xyz>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Sasha Levin <sashal@kernel.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 6d5bcdb9f45d..a3fc0084cda0 100644
--- a/drivers/power/supply/cpcap-battery.c
+++ b/drivers/power/supply/cpcap-battery.c
@@ -786,7 +786,7 @@ 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