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refs/files-backend: fix memory leak in lock_ref_for_update 

After the previous patch, none of the functions we call hold on to
`referent.buf`, so we can safely release the string buffer before
returning.

Reviewed-by: Michael Haggerty <mhagger@alum.mit.edu>
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 2017-09-09 08:57:16 +02:00 коммит произвёл Junio C Hamano
Родитель c299468bd7
Коммит 851e1fbd01
1 изменённых файлов: 20 добавлений и 11 удалений
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31
refs/files-backend.c
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@ -2756,7 +2756,7 @@ static int lock_ref_for_update(struct files_ref_store *refs,
struct strbuf referent = STRBUF_INIT;
int mustexist = (update->flags & REF_HAVE_OLD) &&
!is_null_oid(&update->old_oid);
int ret;
int ret = 0;
struct ref_lock *lock;
files_assert_main_repository(refs, "lock_ref_for_update");
@ -2768,7 +2768,7 @@ static int lock_ref_for_update(struct files_ref_store *refs,
ret = split_head_update(update, transaction, head_ref,
affected_refnames, err);
if (ret)
return ret;
goto out;
}
ret = lock_raw_ref(refs, update->refname, mustexist,
@ -2782,7 +2782,7 @@ static int lock_ref_for_update(struct files_ref_store *refs,
strbuf_addf(err, "cannot lock ref '%s': %s",
original_update_refname(update), reason);
free(reason);
return ret;
goto out;
}
update->backend_data = lock;
@ -2801,10 +2801,12 @@ static int lock_ref_for_update(struct files_ref_store *refs,
strbuf_addf(err, "cannot lock ref '%s': "
"error reading reference",
original_update_refname(update));
return -1;
ret = -1;
goto out;
}
} else if (check_old_oid(update, &lock->old_oid, err)) {
return TRANSACTION_GENERIC_ERROR;
ret = TRANSACTION_GENERIC_ERROR;
goto out;
}
} else {
/*
@ -2818,13 +2820,15 @@ static int lock_ref_for_update(struct files_ref_store *refs,
referent.buf, transaction,
affected_refnames, err);
if (ret)
return ret;
goto out;
}
} else {
struct ref_update *parent_update;
if (check_old_oid(update, &lock->old_oid, err))
return TRANSACTION_GENERIC_ERROR;
if (check_old_oid(update, &lock->old_oid, err)) {
ret = TRANSACTION_GENERIC_ERROR;
goto out;
}
/*
* If this update is happening indirectly because of a
@ -2861,7 +2865,8 @@ static int lock_ref_for_update(struct files_ref_store *refs,
"cannot update ref '%s': %s",
update->refname, write_err);
free(write_err);
return TRANSACTION_GENERIC_ERROR;
ret = TRANSACTION_GENERIC_ERROR;
goto out;
} else {
update->flags |= REF_NEEDS_COMMIT;
}
@ -2875,10 +2880,14 @@ static int lock_ref_for_update(struct files_ref_store *refs,
if (close_ref(lock)) {
strbuf_addf(err, "couldn't close '%s.lock'",
update->refname);
return TRANSACTION_GENERIC_ERROR;
ret = TRANSACTION_GENERIC_ERROR;
goto out;
}
}
return 0;
out:
strbuf_release(&referent);
return ret;
}
/*