1 files changed, 5 insertions, 4 deletions

diff --git a/libbb/find_root_device.c b/libbb/find_root_device.c
index 32c86cea8..8436cd664 100644
--- a/libbb/find_root_device.c
+++ b/libbb/find_root_device.c
@@ -29,14 +29,15 @@ static char *find_block_device_in_dir(struct arena *ap)
         char *retpath = NULL;
         int len, rem;
 
-        dir = opendir(ap->devpath);
-        if (!dir)
-                return NULL;
-
         len = strlen(ap->devpath);
         rem = DEVNAME_MAX-2 - len;
         if (rem <= 0)
                 return NULL;
+
+        dir = opendir(ap->devpath);
+        if (!dir)
+                return NULL;
+
         ap->devpath[len++] = '/';
 
         while ((entry = readdir(dir)) != NULL) {