diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index bfcfc748cc0..b12ce2a99cf 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,8 @@
+2019-03-25  Simon Marchi  <simon.marchi@polymtl.ca>
+
+	* source-cache.c (source_cache::get_source_lines): Re-read
+	fullname after calling open_source_file.
+
 2019-03-18  Pedro Alves  <palves@redhat.com>
 	    Eli Zaretskii <eliz@gnu.org>
 
diff --git a/gdb/source-cache.c b/gdb/source-cache.c
index 9211f098eb7..5eae02082df 100644
--- a/gdb/source-cache.c
+++ b/gdb/source-cache.c
@@ -206,6 +206,12 @@ source_cache::get_source_lines (struct symtab *s, int first_line,
 		  if (desc.get () < 0)
 		    return false;
 		  find_source_lines (s, desc.get ());
+
+		  /* FULLNAME points to a value owned by the symtab
+		     (symtab::fullname).  Calling open_source_file reallocates
+		     that value, so we must refresh FULLNAME to avoid a
+		     use-after-free.  */
+		  fullname = symtab_to_fullname (s);
 		}
 	      srchilite::SourceHighlight highlighter ("esc.outlang");
 	      highlighter.setStyleFile("esc.style");