Fix leak of set/show verbose doc, avoid xfree of static string
In the tests py-pp-registration/gdb.log default/gdb.log foll-fork/gdb.log setshow/gdb.log break-interp/gdb.log Valgrind detects a leak of the doc strings for the set and show verbose cmd. Here is the stacktrace of the leaked set doc: ==25548== 15 bytes in 1 blocks are definitely lost in loss record 101 of 3,120 ==25548== at 0x4C2BE6D: malloc (vg_replace_malloc.c:309) ==25548== by 0x409C27: xmalloc (common-utils.c:44) ==25548== by 0x778AF9: xstrdup (xstrdup.c:34) ==25548== by 0x3F860F: add_setshow_cmd_full(char const*, command_class, var_types, void*, char const*, char const*, char const*, void (*)(char const*, int, cmd_list_element*), void (*)(ui_file*, int, cmd_list_element*, char const*), cmd_list_element**, cmd_list_element**, cmd_list_element**, cmd_list_element**) [clone .constprop.10] (cli-decode.c:495) ==25548== by 0x3F8ADB: add_setshow_boolean_cmd(char const*, command_class, int*, char const*, char const*, char const*, void (*)(char const*, int, cmd_list_element*), void (*)(ui_file*, int, cmd_list_element*, char const*), cmd_list_element**, cmd_list_element**) (cli-decode.c:593) ==25548== by 0x3F7442: _initialize_cli_cmds() (cli-cmds.c:1768) ==25548== by 0x69EED3: initialize_all_files() (init.c:365) ==25548== by 0x658A84: gdb_init(char*) (top.c:2163) ==25548== by 0x5403E1: captured_main_1 (main.c:863) ==25548== by 0x5403E1: captured_main (main.c:1167) ==25548== by 0x5403E1: gdb_main(captured_main_args*) (main.c:1193) ==25548== by 0x289CA7: main (gdb.c:32) The leak is created by top.c set_verbose 'elaborate joke': the doc string is changed according to the verbosity: (gdb) help set verbose Set verbosity. (gdb) set verbose on (gdb) help set verbose Set verbose printing of informational messages. (gdb) set_verbose creates the leak as it replaces the string allocated in the above stacktrace by a static (non translated) string: ... if (info_verbose) { c->doc = "Set verbose printing of informational messages."; ... Also, this can possibly trigger a call to 'free' of a static string, as c->doc_allocated is kept true, while the string is not allocated anymore. This patch: * fixes the leak by freeing the previous docs if doc_allocated. * internationalize the messages. * properly sets doc_allocated to 0 once doc strings are static. gdb/ChangeLog 2018-12-28 Philippe Waroquiers <philippe.waroquiers@skynet.be> * top.c (set_verbose): Free previous docs if doc_allocated. Internationalize messages. Set doc_allocated to 0.
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gdb/top.c
16
gdb/top.c
@ -1820,7 +1820,7 @@ show_history (const char *args, int from_tty)
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int info_verbose = 0; /* Default verbose msgs off. */
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int info_verbose = 0; /* Default verbose msgs off. */
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/* Called by do_setshow_command. An elaborate joke. */
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/* Called by do_set_command. An elaborate joke. */
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void
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void
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set_verbose (const char *args, int from_tty, struct cmd_list_element *c)
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set_verbose (const char *args, int from_tty, struct cmd_list_element *c)
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{
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{
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@ -1830,16 +1830,22 @@ set_verbose (const char *args, int from_tty, struct cmd_list_element *c)
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showcmd = lookup_cmd_1 (&cmdname, showlist, NULL, 1);
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showcmd = lookup_cmd_1 (&cmdname, showlist, NULL, 1);
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gdb_assert (showcmd != NULL && showcmd != CMD_LIST_AMBIGUOUS);
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gdb_assert (showcmd != NULL && showcmd != CMD_LIST_AMBIGUOUS);
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if (c->doc && c->doc_allocated)
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xfree ((char *) c->doc);
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if (showcmd->doc && showcmd->doc_allocated)
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xfree ((char *) showcmd->doc);
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if (info_verbose)
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if (info_verbose)
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{
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{
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c->doc = "Set verbose printing of informational messages.";
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c->doc = _("Set verbose printing of informational messages.");
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showcmd->doc = "Show verbose printing of informational messages.";
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showcmd->doc = _("Show verbose printing of informational messages.");
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}
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}
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else
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else
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{
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{
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c->doc = "Set verbosity.";
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c->doc = _("Set verbosity.");
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showcmd->doc = "Show verbosity.";
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showcmd->doc = _("Show verbosity.");
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}
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}
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c->doc_allocated = 0;
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showcmd->doc_allocated = 0;
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}
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}
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/* Init the history buffer. Note that we are called after the init file(s)
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/* Init the history buffer. Note that we are called after the init file(s)
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