gdb/

	Fix memory double-free.
	* completer.c (line_completion_function): Clear LIST after called xfree.
gdb/testsuite/
	* gdb.base/completion.exp (Completing non-existing component): New test.

1 files changed, 18 insertions, 0 deletions

diff --git a/gdb/testsuite/gdb.base/completion.exp b/gdb/testsuite/gdb.base/completion.exp
index d0d0dd6..2d94fca 100644
--- a/gdb/testsuite/gdb.base/completion.exp
+++ b/gdb/testsuite/gdb.base/completion.exp
@@ -805,6 +805,24 @@ gdb_expect  {
         timeout         { fail "(timeout) complete 'set follow-fork-mode'" }
         }
 
+send_gdb "p values\[0\].nonex.\t"
+gdb_expect  {
+        -re "Type struct some_struct has no component named nonex.\r\n$gdb_prompt $"\
+            { pass "Completing non-existing component" }
+        -re ".*$gdb_prompt $"       { fail "Completing non-existing component" }
+        timeout         { fail "(timeout) Completing non-existing component" }
+        eof             { fail "(eof) Completing non-existing component #2" }
+        }
+# Double memory freeing gets found only on the second run:
+send_gdb "p values\[0\].nonex.\t"
+gdb_expect  {
+        -re "Type struct some_struct has no component named nonex.\r\n$gdb_prompt $"\
+            { pass "Completing non-existing component #2" }
+        -re ".*$gdb_prompt $"       { fail "Completing non-existing component #2" }
+        timeout         { fail "(timeout) Completing non-existing component #2" }
+        eof             { fail "(eof) Completing non-existing component #2" }
+        }
+
 # Restore globals modified in this test...
 if [info exists old_inputrc] {
     set env(INPUTRC) $old_inputrc