reftable/pq: handle allocation failures when adding entries

Handle allocation failures when adding entries to the pqueue. Adapt its
only caller accordingly.

Signed-off-by: Patrick Steinhardt <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: pks-t

reftable/merged.c

@@ -54,7 +54,10 @@ static int merged_iter_advance_subiter(struct merged_iter *mi, size_t idx)
 	if (err)
 		return err;
 
-	merged_iter_pqueue_add(&mi->pq, &e);
+	err = merged_iter_pqueue_add(&mi->pq, &e);
+	if (err)
+		return err;
+
 	return 0;
 }
 

reftable/pq.c

@@ -8,6 +8,7 @@ license that can be found in the LICENSE file or at
 
 #include "pq.h"
 
+#include "reftable-error.h"
 #include "reftable-record.h"
 #include "system.h"
 #include "basics.h"
@@ -44,11 +45,13 @@ struct pq_entry merged_iter_pqueue_remove(struct merged_iter_pqueue *pq)
 	return e;
 }
 
-void merged_iter_pqueue_add(struct merged_iter_pqueue *pq, const struct pq_entry *e)
+int merged_iter_pqueue_add(struct merged_iter_pqueue *pq, const struct pq_entry *e)
 {
 	size_t i = 0;
 
 	REFTABLE_ALLOC_GROW(pq->heap, pq->len + 1, pq->cap);
+	if (!pq->heap)
+		return REFTABLE_OUT_OF_MEMORY_ERROR;
 	pq->heap[pq->len++] = *e;
 
 	i = pq->len - 1;
@@ -59,6 +62,8 @@ void merged_iter_pqueue_add(struct merged_iter_pqueue *pq, const struct pq_entry
 		SWAP(pq->heap[j], pq->heap[i]);
 		i = j;
 	}
+
+	return 0;
 }
 
 void merged_iter_pqueue_release(struct merged_iter_pqueue *pq)

reftable/pq.h

@@ -23,7 +23,7 @@ struct merged_iter_pqueue {
 };
 
 struct pq_entry merged_iter_pqueue_remove(struct merged_iter_pqueue *pq);
-void merged_iter_pqueue_add(struct merged_iter_pqueue *pq, const struct pq_entry *e);
+int merged_iter_pqueue_add(struct merged_iter_pqueue *pq, const struct pq_entry *e);
 void merged_iter_pqueue_release(struct merged_iter_pqueue *pq);
 int pq_less(struct pq_entry *a, struct pq_entry *b);