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prepare_repo_settings(): plug leak of config values 

We call repo_config_get_string() for fetch.negotiationAlgorithm, which
allocates a copy of the string, but we never free it.

We could add a call to free(), but there's an even simpler solution: we
don't need the string to persist beyond a few strcasecmp() calls, so we
can instead use the "_tmp" variant which gives us a const pointer to the
cached value.

We need to switch the type of "strval" to "const char *" for this to
work, which affects a similar call that checks core.untrackedCache. But
it's in the same boat! It doesn't actually need the value to persist
beyond a maybe_bool() check (though it does remember to correctly free
the string afterwards). So we can simplify it at the same time.

Note that this core.untrackedCache check arguably should be using
repo_config_get_maybe_bool(), but there are some subtle behavior
changes. E.g., it doesn't currently allow a value-less "true". Arguably
it should, but let's avoid lumping further changes in what should be a
simple leak cleanup.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King 2022-09-08 01:02:50 -04:00 committed by Junio C Hamano
parent 7e2619d8ff
commit 66eede4a37
1 changed files with 3 additions and 4 deletions
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7
repo-settings.c
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@ -15,7 +15,7 @@ void prepare_repo_settings(struct repository *r)
{
int experimental;
int value;
char *strval;
const char *strval;
int manyfiles;
if (!r->gitdir)
@ -67,7 +67,7 @@ void prepare_repo_settings(struct repository *r)
if (!repo_config_get_int(r, "index.version", &value))
r->settings.index_version = value;
if (!repo_config_get_string(r, "core.untrackedcache", &strval)) {
if (!repo_config_get_string_tmp(r, "core.untrackedcache", &strval)) {
int v = git_parse_maybe_bool(strval);
/*
@ -78,10 +78,9 @@ void prepare_repo_settings(struct repository *r)
if (v >= 0)
r->settings.core_untracked_cache = v ?
UNTRACKED_CACHE_WRITE : UNTRACKED_CACHE_REMOVE;
free(strval);
}
if (!repo_config_get_string(r, "fetch.negotiationalgorithm", &strval)) {
if (!repo_config_get_string_tmp(r, "fetch.negotiationalgorithm", &strval)) {
int fetch_default = r->settings.fetch_negotiation_algorithm;
if (!strcasecmp(strval, "skipping"))
r->settings.fetch_negotiation_algorithm = FETCH_NEGOTIATION_SKIPPING;