linux-kernel - [PATCH 5.17 704/772] lib/string_helpers: fix not adding strarray to devices resource list

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Message-Id: <20220607165009.794182134@linuxfoundation.org>
Date:   Tue,  7 Jun 2022 19:04:56 +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, Puyou Lu <puyou.lu@...il.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Tejun Heo <tj@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH 5.17 704/772] lib/string_helpers: fix not adding strarray to devices resource list

From: Puyou Lu <puyou.lu@...il.com>

commit cd290a9839cee2f6641558877e707bd373c8f6f1 upstream.

Add allocated strarray to device's resource list. This is a must to
automatically release strarray when the device disappears.

Without this fix we have a memory leak in the few drivers which use
devm_kasprintf_strarray().

Link: https://lkml.kernel.org/r/20220506044409.30066-1-puyou.lu@gmail.com
Link: https://lkml.kernel.org/r/20220506073623.2679-1-puyou.lu@gmail.com
Fixes: acdb89b6c87a ("lib/string_helpers: Introduce managed variant of kasprintf_strarray()")
Signed-off-by: Puyou Lu <puyou.lu@...il.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
Cc: Tejun Heo <tj@...nel.org>
Cc: <stable@...r.kernel.org>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 lib/string_helpers.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/lib/string_helpers.c
+++ b/lib/string_helpers.c
@@ -757,6 +757,9 @@ char **devm_kasprintf_strarray(struct de
 		return ERR_PTR(-ENOMEM);
 	}
 
+	ptr->n = n;
+	devres_add(dev, ptr);
+
 	return ptr->array;
 }
 EXPORT_SYMBOL_GPL(devm_kasprintf_strarray);