linux-kernel - [PATCH] mm: check the return value of ioremap() in macio

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Date:   Tue,  2 Aug 2022 15:41:48 +0800
From:   studentxswpy@....com
To:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Cc:     Xie Shaowen <studentxswpy@....com>,
        Hacash Robot <hacashRobot@...tino.com>
Subject: [PATCH] mm: check the return value of ioremap() in macio_init()

From: Xie Shaowen <studentxswpy@....com>

The function ioremap() in macio_init() can fail, so
its return value should be checked.

Fixes: 36874579dbf4c ("[PATCH] powerpc: macio-adb build fix")
Reported-by: Hacash Robot <hacashRobot@...tino.com>
Signed-off-by: Xie Shaowen <studentxswpy@....com>
---
 drivers/macintosh/macio-adb.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/macintosh/macio-adb.c b/drivers/macintosh/macio-adb.c
index 9b63bd2551c6..cd4e34d15c26 100644
--- a/drivers/macintosh/macio-adb.c
+++ b/drivers/macintosh/macio-adb.c
@@ -108,6 +108,10 @@ int macio_init(void)
 		return -ENXIO;
 	}
 	adb = ioremap(r.start, sizeof(struct adb_regs));
+	if (!adb) {
+		of_node_put(adbs);
+		return -ENOMEM;
+	}
 
 	out_8(&adb->ctrl.r, 0);
 	out_8(&adb->intr.r, 0);
-- 
2.25.1