[PATCH 6.1 55/60] power: supply: gpio-charger: Fix set charge current limits

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

6.1-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Dimitri Fedrau <dimitri.fedrau@liebherr.com>

commit afc6e39e824ad0e44b2af50a97885caec8d213d1 upstream.

Fix set charge current limits for devices which allow to set the lowest
charge current limit to be greater zero. If requested charge current limit
is below lowest limit, the index equals current_limit_map_size which leads
to accessing memory beyond allocated memory.

Fixes: be2919d8355e ("power: supply: gpio-charger: add charge-current-limit feature")
Cc: stable@vger.kernel.org
Signed-off-by: Dimitri Fedrau <dimitri.fedrau@liebherr.com>
Link: https://lore.kernel.org/r/20241209-fix-charge-current-limit-v1-1-760d9b8f2af3@liebherr.com
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/power/supply/gpio-charger.c |    8 ++++++++
 1 file changed, 8 insertions(+)

--- a/drivers/power/supply/gpio-charger.c
+++ b/drivers/power/supply/gpio-charger.c
@@ -67,6 +67,14 @@ static int set_charge_current_limit(stru
 		if (gpio_charger->current_limit_map[i].limit_ua <= val)
 			break;
 	}
+
+	/*
+	 * If a valid charge current limit isn't found, default to smallest
+	 * current limitation for safety reasons.
+	 */
+	if (i >= gpio_charger->current_limit_map_size)
+		i = gpio_charger->current_limit_map_size - 1;
+
 	mapping = gpio_charger->current_limit_map[i];
 
 	for (i = 0; i < ndescs; i++) {