From b5c99ec30eb5fbe46ed3f4d7bf03415132850a30 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Christian=20G=C3=B6ttsche?= <cgzones@googlemail.com>
Date: Thu, 26 Jan 2023 21:03:56 +0100
Subject: [PATCH] lib/btrfs: avoid NULL-dereference

    btrfs.c:42:13: warning: use of NULL 'cmd' where non-null expected [CWE-476] [-Wanalyzer-null-argument]

Reviewed-by: Alejandro Colomar <alx@kernel.org>
Cherry-picked-from: 54ab542887994f8b6e5411469d6867e3a2e58800
Link: <https://github.com/shadow-maint/shadow/pull/770>
Reviewed-by: Michael Vetter <jubalh@iodoru.org>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
---
 lib/btrfs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/btrfs.c b/lib/btrfs.c
index a2563f7c..03915981 100644
--- a/lib/btrfs.c
+++ b/lib/btrfs.c
@@ -39,7 +39,7 @@ static int run_btrfs_subvolume_cmd(const char *subcmd, const char *arg1, const c
 		NULL
 	};
 
-	if (access(cmd, X_OK)) {
+	if (!cmd || access(cmd, X_OK)) {
 		return 1;
 	}