Having ...
[core]
excludesFile = /some/global/path/.gitignore
... this triggers a leak:
$ GIT_EDITOR=: git rebase -i HEAD
Successfully rebased and updated detached HEAD.
=================================================================
==...==ERROR: LeakSanitizer: detected memory leaks
Direct leak of 60 byte(s) in 1 object(s) allocated from:
#0 ... in realloc
#1 ... in xrealloc wrapper.c:137
#2 ... in strbuf_grow strbuf.c:112
#3 ... in strbuf_add strbuf.c:311
#4 ... in strbuf_addstr strbuf.h:310
#5 ... in interpolate_path path.c:771
#6 ... in git_config_pathname config.c:1352
#7 ... in git_default_core_config config.c:1588
#8 ... in git_default_config config.c:1791
#9 ... in rebase_config builtin/rebase.c:801
#10 ... in configset_iter config.c:2161
#11 ... in repo_config config.c:2540
#12 ... in git_config config.c:2663
#13 ... in cmd_rebase builtin/rebase.c:1187
#14 ... in run_builtin git.c:469
#15 ... in handle_builtin git.c:724
#16 ... in run_argv git.c:788
#17 ... in cmd_main git.c:923
#18 ... in main common-main.c:62
It happens because we parse twice the configuration:
$ GIT_EDITOR=: gdb --ex "break git_config" --ex "run" --args git rebase -i HEAD
(gdb) bt
#0 git_config () at config.c:2663
#1 ... in cmd_rebase () at builtin/rebase.c:1187
#2 ... in run_builtin () at git.c:469
#3 ... in handle_builtin () at git.c:724
#4 ... in run_argv () at git.c:788
#5 ... in cmd_main () at git.c:923
#6 ... in main () at common-main.c:62
(gdb) c
(gdb) bt
#0 git_config () at config.c:2663
#1 ... in sequencer_init_config () at sequencer.c:291
#2 ... in get_replay_opts () at builtin/rebase.c:161
#3 ... in do_interactive_rebase () at builtin/rebase.c:271
#4 ... in run_sequencer_rebase () at builtin/rebase.c:339
#5 ... in run_specific_rebase () at builtin/rebase.c:705
#6 ... in cmd_rebase () at builtin/rebase.c:1830
#7 ... in run_builtin () at git.c:469
#8 ... in handle_builtin () at git.c:724
#9 ... in run_argv () at git.c:788
#10 ... in cmd_main () at git.c:923
#11 ... in main () at common-main.c:62
We call twice to git_config(): first to get the main git-branch(1) options,
and second to get the ones related to the sequencer.
Due to how git_config() works the global configuration is parsed twice,
therefore if core.excludesFile is set, it will be allocated twice.
A free() before the git_config_pathname() can be a simpler fix, but I
think this series offers a better approach, perhaps applicable to other
potential similar leaks.
Rubén Justo (4):
path.c: introduce strbuf_interpolate_path
config.c: introduce git_config_strbuf_pathname
environment.c: convert excludes_file to struct strbuf
t7300: mark as leak-free
config.c | 12 +++++++++++-
config.h | 2 ++
dir.c | 13 +++++++++----
environment.c | 2 +-
environment.h | 2 +-
path.c | 20 ++++++++++++++------
path.h | 1 +
t/t7300-clean.sh | 1 +
8 files changed, 40 insertions(+), 13 deletions(-)
--
2.44.0.697.g9b33b46f29
