Allow ref_transaction_free to be called with NULL and as a result allow
ref_transaction_rollback to be called for a NULL transaction.
This allows us to write code that will
if ( (!transaction ||
ref_transaction_update(...)) ||
(ref_transaction_commit(...) && !(transaction = NULL)) {
ref_transaction_rollback(transaction);
...
}
In this case transaction is reset to NULL IFF ref_transaction_commit() was
invoked and thus the rollback becomes ref_transaction_rollback(NULL) which
is safe. IF the conditional triggered prior to ref_transaction_commit()
then transaction is untouched and then ref_transaction_rollback(transaction)
will rollback the failed transaction.
Reviewed-by: Jonathan Nieder <jrnieder@xxxxxxxxx>
Signed-off-by: Ronnie Sahlberg <sahlberg@xxxxxxxxxx>
---
refs.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/refs.c b/refs.c
index 2114748..88d73c8 100644
--- a/refs.c
+++ b/refs.c
@@ -3312,6 +3312,9 @@ static void ref_transaction_free(struct ref_transaction *transaction)
{
int i;
+ if (!transaction)
+ return;
+
for (i = 0; i < transaction->nr; i++)
free(transaction->updates[i]);
--
2.0.0.rc3.477.g0f8edf7
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