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dir: fix off by one errors for ignored and untracked entries

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In `treat_directory()` we perform some logic to handle ignored and
untracked entries. When populating a directory with entries we first
save the current number of ignored/untracked entries and then populate
new entries at the end of our arrays that keep track of those entries.
When we figure out that all entries have been ignored/are untracked we
then remove this tail of entries from those vectors again. But there is
an off by one error in both paths that causes us to not free the first
ignored and untracked entries, respectively.

Fix these off-by-one errors to plug the resulting leak. While at it,
massage the code a bit to match our modern code style.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Patrick Steinhardt 2024-09-26 13:46:24 +02:00 committed by Junio C Hamano
parent 5bf922a4e9
commit 04ff8008f3
4 changed files with 5 additions and 4 deletions
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6
dir.c
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@ -2135,8 +2135,7 @@ static enum path_treatment treat_directory(struct dir_struct *dir,
*/
state = path_none;
} else {
int i;
for (i = old_ignored_nr + 1; i<dir->ignored_nr; ++i)
for (int i = old_ignored_nr; i < dir->ignored_nr; i++)
FREE_AND_NULL(dir->ignored[i]);
dir->ignored_nr = old_ignored_nr;
}
@ -2148,8 +2147,7 @@ static enum path_treatment treat_directory(struct dir_struct *dir,
*/
if ((dir->flags & DIR_SHOW_IGNORED_TOO) &&
!(dir->flags & DIR_KEEP_UNTRACKED_CONTENTS)) {
int i;
for (i = old_untracked_nr + 1; i<dir->nr; ++i)
for (int i = old_untracked_nr; i < dir->nr; i++)
FREE_AND_NULL(dir->entries[i]);
dir->nr = old_untracked_nr;
}

1
t/t3011-common-prefixes-and-directory-traversal.sh
View file

@ -2,6 +2,7 @@
test_description='directory traversal handling, especially with common prefixes'
TEST_PASSES_SANITIZE_LEAK=true
. ./test-lib.sh
test_expect_success 'setup' '

1
t/t7061-wtstatus-ignore.sh
View file

@ -2,6 +2,7 @@
test_description='git-status ignored files'
TEST_PASSES_SANITIZE_LEAK=true
. ./test-lib.sh
cat >expected <<\EOF

1
t/t7521-ignored-mode.sh
View file

@ -2,6 +2,7 @@
test_description='git status ignored modes'
TEST_PASSES_SANITIZE_LEAK=true
. ./test-lib.sh
test_expect_success 'setup initial commit and ignore file' '