From 4a8110007bf58be329f108374e00ef8ddc1fe3ec Mon Sep 17 00:00:00 2001 From: Philippe Waroquiers Date: Tue, 4 Dec 2018 23:28:14 +0100 Subject: [PATCH] Fix a (one shot small) leak in language.c Valgrind detects the following leak: ==28395== VALGRIND_GDB_ERROR_BEGIN ==28395== 5 bytes in 1 blocks are definitely lost in loss record 20 of 2,770 ==28395== at 0x4C2BE2D: malloc (vg_replace_malloc.c:299) ==28395== by 0x41D9E7: xmalloc (common-utils.c:44) ==28395== by 0x78BF39: xstrdup (xstrdup.c:34) ==28395== by 0x51F1AC: _initialize_language() (language.c:1175) ==28395== by 0x6B3356: initialize_all_files() (init.c:308) ==28395== by 0x66D194: gdb_init(char*) (top.c:2159) ==28395== by 0x554C11: captured_main_1 (main.c:863) ==28395== by 0x554C11: captured_main (main.c:1167) ==28395== by 0x554C11: gdb_main(captured_main_args*) (main.c:1193) ==28395== by 0x29D837: main (gdb.c:32) ==28395== ==28395== VALGRIND_GDB_ERROR_END This is a very small leak (1 block/5 bytes), happening only once per GDB startup as far as I can see. But this fix make the nr of leaking GDB in the testsuite decreasing from 628 to 566. It is unclear why a xstrdup-ed value is assigned to 'language' at initialization time, while a static "auto" string is assigned as part of the set_language_command. So, that shows that it is ok to initialize 'language' directly with "auto". Also, I cannot find any place where 'language' is xfree-d. No leak was detected for 'range' and 'case_sensitive', but similarly, no indication why a static string cannot be assigned. Regression-tested on debian/x86_64. Also, full testsuite run under valgrind, less tests leaking, and no dangling pointer problem detected. gdb/ChangeLog 2018-12-05 Philippe Waroquiers * language.c (_initialize_language): Fix leak by assigning a static string to language. Same for range and case_sensitive, even if no leak is detected for these variables. --- gdb/ChangeLog | 6 ++++++ gdb/language.c | 6 +++--- 2 files changed, 9 insertions(+), 3 deletions(-) diff --git a/gdb/ChangeLog b/gdb/ChangeLog index d863f918c6..eaea262227 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,9 @@ +2018-12-05 Philippe Waroquiers + + * language.c (_initialize_language): Fix leak by assigning + a static string to language. Same for range and case_sensitive, + even if no leak is detected for these variables. + 2018-12-05 John Baldwin * configure: Re-generate. diff --git a/gdb/language.c b/gdb/language.c index e2f400161b..0ec61c3f5a 100644 --- a/gdb/language.c +++ b/gdb/language.c @@ -1172,9 +1172,9 @@ For Fortran the default is off; for other languages the default is on."), add_set_language_command (); - language = xstrdup ("auto"); - range = xstrdup ("auto"); - case_sensitive = xstrdup ("auto"); + language = "auto"; + range = "auto"; + case_sensitive = "auto"; /* Have the above take effect. */ set_language (language_auto); -- 2.34.1