linux-kernel - [PATCH] s390/sclp: Add check for get_zeroed

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Message-Id: <20250217153146.2372134-1-haoxiang_li2024@163.com>
Date: Mon, 17 Feb 2025 23:31:46 +0800
From: Haoxiang Li <haoxiang_li2024@....com>
To: hca@...ux.ibm.com,
	gor@...ux.ibm.com,
	agordeev@...ux.ibm.com,
	borntraeger@...ux.ibm.com,
	svens@...ux.ibm.com,
	haoxiang_li2024@....com,
	schwidefsky@...ibm.com
Cc: linux-s390@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Subject: [PATCH] s390/sclp: Add check for get_zeroed_page()

Add check for the return value of get_zeroed_page() in
sclp_console_init() to prevent null pointer dereference.

Fixes: 4c8f4794b61e ("[S390] sclp console: convert from bootmem to slab")
Cc: stable@...r.kernel.org
Signed-off-by: Haoxiang Li <haoxiang_li2024@....com>
---
 drivers/s390/char/sclp_con.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/s390/char/sclp_con.c b/drivers/s390/char/sclp_con.c
index e5d947c763ea..7447076b1ec1 100644
--- a/drivers/s390/char/sclp_con.c
+++ b/drivers/s390/char/sclp_con.c
@@ -282,6 +282,8 @@ sclp_console_init(void)
 	/* Allocate pages for output buffering */
 	for (i = 0; i < sclp_console_pages; i++) {
 		page = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
+		if (!page)
+			return -ENOMEM;
 		list_add_tail(page, &sclp_con_pages);
 	}
 	sclp_conbuf = NULL;
-- 
2.25.1