[PATCH] perf subcmd: Fix missing check for return value of malloc() in add_cmdname()

[Chenyuan Mi]

The malloc() function may return NULL when it fails,
which may cause null pointer deference in add_cmdname(),
add Null check for return value of malloc().

Found by our static analysis tool.

Signed-off-by: Chenyuan Mi <cymi20@xxxxxxxxxxxx>
---
 tools/lib/subcmd/help.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/lib/subcmd/help.c b/tools/lib/subcmd/help.c
index bf02d62a3b2b..510a3eccb60f 100644
--- a/tools/lib/subcmd/help.c
+++ b/tools/lib/subcmd/help.c
@@ -16,6 +16,8 @@
 void add_cmdname(struct cmdnames *cmds, const char *name, size_t len)
 {
 	struct cmdname *ent = malloc(sizeof(*ent) + len + 1);
+	if (!ent)
+		return;
 
 	ent->len = len;
 	memcpy(ent->name, name, len);
-- 
2.17.1