linux-kernel - [PATCH] mips: sgi-ip22: add a check for the return of kzalloc()

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Date:   Fri, 25 Mar 2022 18:57:18 +0800
From:   xkernel.wang@...mail.com
To:     tsbogend@...ha.franken.de
Cc:     linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        Xiaoke Wang <xkernel.wang@...mail.com>
Subject: [PATCH] mips: sgi-ip22: add a check for the return of kzalloc()

From: Xiaoke Wang <xkernel.wang@...mail.com>

kzalloc() is a memory allocation function which can return NULL when
some internal memory errors happen. So it is better to check it to
prevent potential wrong memory access.

Signed-off-by: Xiaoke Wang <xkernel.wang@...mail.com>
---
 arch/mips/sgi-ip22/ip22-gio.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/mips/sgi-ip22/ip22-gio.c b/arch/mips/sgi-ip22/ip22-gio.c
index dfc52f6..38d12f4 100644
--- a/arch/mips/sgi-ip22/ip22-gio.c
+++ b/arch/mips/sgi-ip22/ip22-gio.c
@@ -363,6 +363,8 @@ static void ip22_check_gio(int slotno, unsigned long addr, int irq)
 		printk(KERN_INFO "GIO: slot %d : %s (id %x)\n",
 		       slotno, name, id);
 		gio_dev = kzalloc(sizeof *gio_dev, GFP_KERNEL);
+		if (!gio_dev)
+			return;
 		gio_dev->name = name;
 		gio_dev->slotno = slotno;
 		gio_dev->id.id = id;
--