[for-linus][PATCH 2/7] proc: bootconfig: Add null pointer check

From: Steven Rostedt
Date: Sun Apr 03 2022 - 10:32:10 EST

From: Lv Ruyi <lv.ruyi@xxxxxxxxxx>

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@xxxxxxxxxx

Cc: stable@xxxxxxxxxxxxxxx
Fixes: c1a3c36017d4 ("proc: bootconfig: Add /proc/bootconfig to show boot config list")
Acked-by: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
Reported-by: Zeal Robot <zealci@xxxxxxxxxx>
Signed-off-by: Lv Ruyi <lv.ruyi@xxxxxxxxxx>
Signed-off-by: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx>
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);