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Use gdb::unique_xmalloc_ptr<char> in command_line_input to fix a leak 

Following the change of logic where the input_handler gets a
gdb::unique_xmalloc_ptr<char>, a call to readline directly
followed by a call to handle_line_of_input is missing a free,
and causes the below leak.

Use gdb::unique_xmalloc_ptr<char> to solve the leak.

==16291== VALGRIND_GDB_ERROR_BEGIN
==16291== 64 bytes in 1 blocks are definitely lost in loss record 1,815 of 4,111
==16291==    at 0x4C2E2B3: realloc (vg_replace_malloc.c:836)
==16291==    by 0x41EB1C: xrealloc (common-utils.c:62)
==16291==    by 0x41DBD3: buffer_grow(buffer*, char const*, unsigned long) [clone .part.1] (buffer.c:40)
==16291==    by 0x66E8FF: buffer_grow_char (buffer.h:40)
==16291==    by 0x66E8FF: gdb_readline_no_editing (top.c:798)
==16291==    by 0x66E8FF: command_line_input(char const*, char const*) (top.c:1249)
==16291==    by 0x66EBD8: read_command_file(_IO_FILE*) (top.c:421)
==16291==    by 0x412C0C: script_from_file(_IO_FILE*, char const*) (cli-script.c:1547)
==16291==    by 0x40BE90: source_script_from_stream (cli-cmds.c:569)
==16291==    by 0x40BE90: source_script_with_search(char const*, int, int) (cli-cmds.c:606)
==16291==    by 0x54D567: catch_command_errors(void (*)(char const*, int), char const*, int) (main.c:379)
==16291==    by 0x54EA84: captured_main_1 (main.c:994)
==16291==    by 0x54EA84: captured_main (main.c:1167)
==16291==    by 0x54EA84: gdb_main(captured_main_args*) (main.c:1193)
==16291==    by 0x29DA27: main (gdb.c:32)
==16291==
==16291== VALGRIND_GDB_ERROR_END

gdb/ChangeLog
2018-12-31  Philippe Waroquiers  <philippe.waroquiers@skynet.be>

	* top.c (command_line_input): Use unique_xmalloc_ptr to
	manage memory allocated by readline.
This commit is contained in:
Philippe Waroquiers 2018-12-30 20:41:49 +01:00
parent 8fd04a4255
commit 2139e8dc9f
2 changed files with 10 additions and 5 deletions
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5
gdb/ChangeLog
View File

@ -1,3 +1,8 @@
2018-12-31 Philippe Waroquiers <philippe.waroquiers@skynet.be>
* top.c (command_line_input): Use unique_xmalloc_ptr to
manage memory allocated by readline.
2018-12-30 Tom Tromey <tom@tromey.com>
* event-top.h (command_line_handler): Update.

10
gdb/top.c
View File

@ -1212,7 +1212,7 @@ command_line_input (const char *prompt_arg, const char *annotation_suffix)
while (1)
{
char *rl;
gdb::unique_xmalloc_ptr<char> rl;
/* Make sure that all output has been output. Some machines may
let you get away with leaving out some of the gdb_flush, but
@ -1236,20 +1236,20 @@ command_line_input (const char *prompt_arg, const char *annotation_suffix)
&& from_tty
&& input_interactive_p (current_ui))
{
rl = (*deprecated_readline_hook) (prompt);
rl.reset ((*deprecated_readline_hook) (prompt));
}
else if (command_editing_p
&& from_tty
&& input_interactive_p (current_ui))
{
rl = gdb_readline_wrapper (prompt);
rl.reset (gdb_readline_wrapper (prompt));
}
else
{
rl = gdb_readline_no_editing (prompt);
rl.reset (gdb_readline_no_editing (prompt));
}
cmd = handle_line_of_input (&cmd_line_buffer, rl,
cmd = handle_line_of_input (&cmd_line_buffer, rl.get (),
0, annotation_suffix);
if (cmd == (char *) EOF)
{