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From:   Liao Chang <liaochang1@huawei.com>
To:     <chenhuacai@kernel.org>, <jiaxun.yang@flygoat.com>,
        <tsbogend@alpha.franken.de>, <tangyouling@loongson.cn>,
        <hejinyang@loongson.cn>
CC:     <linux-mips@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <liaochang1@huawei.com>
Subject: [PATCH] MIPS: Loongson64: Add WARN_ON on kexec related kmalloc failed
Date:   Thu, 3 Nov 2022 09:18:15 +0800
Message-ID: <20221103011815.139424-1-liaochang1@huawei.com>
MIME-Version: 1.0
Content-Type: text/plain
Precedence: bulk

Add WARN_ON on kexec related kmalloc failed, avoid to pass NULL pointer
to following memcpy and loongson_kexec_prepare.

Fixes: 6ce48897ce47 ("MIPS: Loongson64: Add kexec/kdump support")
Signed-off-by: Liao Chang <liaochang1@huawei.com>
---
 arch/mips/loongson64/reset.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/mips/loongson64/reset.c b/arch/mips/loongson64/reset.c
index 758d5d26aaaa..e420800043b0 100644
--- a/arch/mips/loongson64/reset.c
+++ b/arch/mips/loongson64/reset.c
@@ -16,6 +16,7 @@
 #include <asm/bootinfo.h>
 #include <asm/idle.h>
 #include <asm/reboot.h>
+#include <asm/bug.h>
 
 #include <loongson.h>
 #include <boot_param.h>
@@ -159,8 +160,17 @@ static int __init mips_reboot_setup(void)
 
 #ifdef CONFIG_KEXEC
 	kexec_argv = kmalloc(KEXEC_ARGV_SIZE, GFP_KERNEL);
+	if (WARN_ON(!kexec_argv))
+		return -ENOMEM;
+
 	kdump_argv = kmalloc(KEXEC_ARGV_SIZE, GFP_KERNEL);
+	if (WARN_ON(!kdump_argv))
+		return -ENOMEM;
+
 	kexec_envp = kmalloc(KEXEC_ENVP_SIZE, GFP_KERNEL);
+	if (WARN_ON(!kexec_envp))
+		return -ENOMEM;
+
 	fw_arg1 = KEXEC_ARGV_ADDR;
 	memcpy(kexec_envp, (void *)fw_arg2, KEXEC_ENVP_SIZE);
 
-- 
2.17.1