1 files changed, 12 insertions, 2 deletions
diff --git a/libdw/dwarf_filesrc.c b/libdw/dwarf_filesrc.c
index b48340d4..74b3cf16 100644
--- a/libdw/dwarf_filesrc.c
+++ b/libdw/dwarf_filesrc.c
@@ -59,14 +59,24 @@ const char *
 dwarf_filesrc (Dwarf_Files *file, size_t idx, Dwarf_Word *mtime,
 	       Dwarf_Word *length)
 {
-  if (file == NULL || idx >= file->nfiles)
+  if (file == NULL)
     return NULL;
 
+  const char *retval = NULL;
+  rwlock_rdlock (file->dbg->lock);
+
+  if (idx >= file->nfiles)
+    goto out;
+
   if (mtime != NULL)
     *mtime = file->info[idx].mtime;
 
   if (length != NULL)
     *length = file->info[idx].length;
 
-  return file->info[idx].name;
+  retval = file->info[idx].name;
+
+ out:
+  rwlock_unlock (file->dbg->lock);
+  return retval;
 }