releases/6.1.75/mfd-syscon-fix-null-pointer-dereference-in-of_syscon.patch

From 56373ff555a8f49fb52edc5efe9fa106782d0e38 Mon Sep 17 00:00:00 2001
From: Sasha Levin <sashal@kernel.org>
Date: Mon, 4 Dec 2023 17:24:43 +0800
Subject: mfd: syscon: Fix null pointer dereference in of_syscon_register()

From: Kunwu Chan <chentao@kylinos.cn>

[ Upstream commit 41673c66b3d0c09915698fec5c13b24336f18dd1 ]

kasprintf() returns a pointer to dynamically allocated memory
which can be NULL upon failure.

Fixes: e15d7f2b81d2 ("mfd: syscon: Use a unique name with regmap_config")
Signed-off-by: Kunwu Chan <chentao@kylinos.cn>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20231204092443.2462115-1-chentao@kylinos.cn
Signed-off-by: Lee Jones <lee@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/mfd/syscon.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/mfd/syscon.c b/drivers/mfd/syscon.c
index bdb2ce7ff03b..6196724ef39b 100644
--- a/drivers/mfd/syscon.c
+++ b/drivers/mfd/syscon.c
@@ -102,6 +102,10 @@ static struct syscon *of_syscon_register(struct device_node *np, bool check_clk)
 	}
 
 	syscon_config.name = kasprintf(GFP_KERNEL, "%pOFn@%pa", np, &res.start);
+	if (!syscon_config.name) {
+		ret = -ENOMEM;
+		goto err_regmap;
+	}
 	syscon_config.reg_stride = reg_io_width;
 	syscon_config.val_bits = reg_io_width * 8;
 	syscon_config.max_register = resource_size(&res) - reg_io_width;
-- 
2.43.0