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builtin/commit: fix memory leak in prepare_index()

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Release `pathspec` and the string list `partial`.

When we clear the string list, make sure we do not free the `util`
pointers. That would result in double-freeing, since we set them up as
`item->util = item` in `list_paths()`.

Initialize the string list early, so that we can always release it. That
introduces some unnecessary overhead in various code paths, but means
there is one and only one way out of the function. If we ever accumulate
more things we need to free, it should be straightforward to do so.

Signed-off-by: Martin Ågren <martin.agren@gmail.com>
Reviewed-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Martin Ågren 2017-09-23 01:34:49 +02:00 committed by Junio C Hamano
parent 94c9fd268d
commit dd1055ed59
1 changed files with 10 additions and 5 deletions
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15
builtin/commit.c
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@ -336,7 +336,7 @@ static void refresh_cache_or_die(int refresh_flags)
static const char *prepare_index(int argc, const char **argv, const char *prefix,
const struct commit *current_head, int is_status)
{
struct string_list partial;
struct string_list partial = STRING_LIST_INIT_DUP;
struct pathspec pathspec;
int refresh_flags = REFRESH_QUIET;
const char *ret;
@ -381,7 +381,8 @@ static const char *prepare_index(int argc, const char **argv, const char *prefix
warning(_("Failed to update main cache tree"));
commit_style = COMMIT_NORMAL;
return get_lock_file_path(&index_lock);
ret = get_lock_file_path(&index_lock);
goto out;
}
/*
@ -404,7 +405,8 @@ static const char *prepare_index(int argc, const char **argv, const char *prefix
if (write_locked_index(&the_index, &index_lock, CLOSE_LOCK))
die(_("unable to write new_index file"));
commit_style = COMMIT_NORMAL;
return get_lock_file_path(&index_lock);
ret = get_lock_file_path(&index_lock);
goto out;
}
/*
@ -430,7 +432,8 @@ static const char *prepare_index(int argc, const char **argv, const char *prefix
rollback_lock_file(&index_lock);
}
commit_style = COMMIT_AS_IS;
return get_index_file();
ret = get_index_file();
goto out;
}
/*
@ -461,7 +464,6 @@ static const char *prepare_index(int argc, const char **argv, const char *prefix
die(_("cannot do a partial commit during a cherry-pick."));
}
string_list_init(&partial, 1);
if (list_paths(&partial, !current_head ? NULL : "HEAD", prefix, &pathspec))
exit(1);
@ -491,6 +493,9 @@ static const char *prepare_index(int argc, const char **argv, const char *prefix
discard_cache();
ret = get_lock_file_path(&false_lock);
read_cache_from(ret);
out:
string_list_clear(&partial, 0);
clear_pathspec(&pathspec);
return ret;
}