[PATCH] s390/sclp: Add check for get_zeroed_page()

[Haoxiang Li]

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@xxxxxxxxxxxxxxx
Signed-off-by: Haoxiang Li <haoxiang_li2024@xxxxxxx>
---
 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