From: Xie Shaowen <studentxswpy@163.com>
Date: Tue, 2 Aug 2022 07:41:48 +0000 (+0800)
Subject: macintosh/macio-adb: check the return value of ioremap()
X-Git-Tag: v4.9.337~91
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=aaf59a444bfed08518da435dfd203ebb07e6d1d2;p=thirdparty%2Fkernel%2Fstable.git

macintosh/macio-adb: check the return value of ioremap()

[ Upstream commit dbaa3105736d4d73063ea0a3b01cd7fafce924e6 ]

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@santino.com>
Signed-off-by: Xie Shaowen <studentxswpy@163.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220802074148.3213659-1-studentxswpy@163.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/drivers/macintosh/macio-adb.c b/drivers/macintosh/macio-adb.c
index 87de8d9bcfada..e620c50768cdc 100644
--- a/drivers/macintosh/macio-adb.c
+++ b/drivers/macintosh/macio-adb.c
@@ -106,6 +106,10 @@ 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);