From b6fb1ee51c9a773d2d6044993af6c0fd7499638f Mon Sep 17 00:00:00 2001 From: Philippe Waroquiers Date: Sun, 20 Jan 2019 16:59:00 +0100 Subject: [PATCH] Fix leak in event-top.c history expansion E.g. in gdb.base/default.exp, valgrind detects leaks such as ==17663== 1,438 bytes in 101 blocks are definitely lost in loss record 2,804 of 2,884 ==17663== at 0x4C2BE6D: malloc (vg_replace_malloc.c:309) ==17663== by 0x418A17: xmalloc (common-utils.c:44) ==17663== by 0x4E6F19C: history_expand (histexpand.c:1061) ==17663== by 0x4B4490: handle_line_of_input(buffer*, char const*, int, char const*) (event-top.c:685) ==17663== by 0x4B4562: command_line_handler(std::unique_ptr >&&) (event-top.c:753) ... Fix the leak by using an unique_xmalloc_ptr for history_value. gdb/ChangeLog 2019-01-22 Philippe Waroquiers * event-top.c (handle_line_of_input): use unique_xmalloc_ptr for history_value. --- gdb/ChangeLog | 5 +++++ gdb/event-top.c | 18 ++++++++---------- 2 files changed, 13 insertions(+), 10 deletions(-) diff --git a/gdb/ChangeLog b/gdb/ChangeLog index 04e8c2d56f..8e03dbf883 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,8 @@ +2019-01-22 Philippe Waroquiers + + * event-top.c (handle_line_of_input): use unique_xmalloc_ptr for + history_value. + 2019-01-21 Tom Tromey * ui-out.c: Fix includes. diff --git a/gdb/event-top.c b/gdb/event-top.c index 3d3d6275d7..920b47f7e3 100644 --- a/gdb/event-top.c +++ b/gdb/event-top.c @@ -679,31 +679,29 @@ handle_line_of_input (struct buffer *cmd_line_buffer, /* Do history expansion if that is wished. */ if (history_expansion_p && from_tty && input_interactive_p (current_ui)) { - char *history_value; + char *cmd_expansion; int expanded; - expanded = history_expand (cmd, &history_value); + expanded = history_expand (cmd, &cmd_expansion); + gdb::unique_xmalloc_ptr history_value (cmd_expansion); if (expanded) { size_t len; /* Print the changes. */ - printf_unfiltered ("%s\n", history_value); + printf_unfiltered ("%s\n", history_value.get ()); /* If there was an error, call this function again. */ if (expanded < 0) - { - xfree (history_value); - return cmd; - } + return cmd; /* history_expand returns an allocated string. Just replace our buffer with it. */ - len = strlen (history_value); + len = strlen (history_value.get ()); xfree (buffer_finish (cmd_line_buffer)); - cmd_line_buffer->buffer = history_value; + cmd_line_buffer->buffer = history_value.get (); cmd_line_buffer->buffer_size = len + 1; - cmd = history_value; + cmd = history_value.release (); } } -- 2.34.1