don't crash on reading a closed dir handle

Fixes RT #131301 Not sure if a change for windows is needed, as it already checks for invalid handle values.
MoarVM · May 13, 2017 · 22fb8e4 · 22fb8e4
1 parent 6d5ea04
commit 22fb8e4
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/src/io/dirops.c b/src/io/dirops.c
@@ -322,6 +322,10 @@ MVMString * MVM_dir_read(MVMThreadContext *tc, MVMObject *oshandle) {
     struct dirent *entry;
     errno = 0; /* must reset errno so we won't check old errno */
 
+    if (!data->dir_handle) {
+        MVM_exception_throw_adhoc(tc, "Cannot read a closed dir handle.");
+    }
+
     entry = readdir(data->dir_handle);
 
     if (errno == 0) {