linux-kernel - [PATCH] proc: bootconfig: add null pointer check

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Date:   Tue, 29 Mar 2022 10:40:04 +0000
From:   cgel.zte@...il.com
To:     mhiramat@...nel.org
Cc:     linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        Lv Ruyi <lv.ruyi@....com.cn>, Zeal Robot <zealci@....com.cn>
Subject: [PATCH] proc: bootconfig: add null pointer check

From: Lv Ruyi <lv.ruyi@....com.cn>

kzalloc is a memory allocation function which can return NULL when some
internal memory errors happen. It is safer to add null pointer check.

Reported-by: Zeal Robot <zealci@....com.cn>
Signed-off-by: Lv Ruyi <lv.ruyi@....com.cn>
---
 fs/proc/bootconfig.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/proc/bootconfig.c b/fs/proc/bootconfig.c
index 6d8d4bf20837..2e244ada1f97 100644
--- a/fs/proc/bootconfig.c
+++ b/fs/proc/bootconfig.c
@@ -32,6 +32,8 @@ static int __init copy_xbc_key_value_list(char *dst, size_t size)
 	int ret = 0;
 
 	key = kzalloc(XBC_KEYLEN_MAX, GFP_KERNEL);
+	if (!key)
+		return -ENOMEM;
 
 	xbc_for_each_key_value(leaf, val) {
 		ret = xbc_node_compose_key(leaf, key, XBC_KEYLEN_MAX);
-- 
2.25.1