From bed5b60bf67ccd8957b8c0558fead30c4a3f5d3f Mon Sep 17 00:00:00 2001
From: Lv Ruyi <lv.ruyi@zte.com.cn>
Date: Tue, 29 Mar 2022 10:40:04 +0000
Subject: [PATCH] proc: bootconfig: Add null pointer check
Git-commit: bed5b60bf67ccd8957b8c0558fead30c4a3f5d3f
Patch-mainline: v5.18-rc1
References: git-fixes

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

Link: https://lkml.kernel.org/r/20220329104004.2376879-1-lv.ruyi@zte.com.cn

Cc: stable@vger.kernel.org
Fixes: c1a3c36017d4 ("proc: bootconfig: Add /proc/bootconfig to show boot config list")
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Reported-by: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: Lv Ruyi <lv.ruyi@zte.com.cn>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 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);
-- 
2.31.1