[PATCH 2/2] lib/btree: Fix possible NULL pointer dereference

[Denis Kirjanov <kirjanov@xxxxxxxxx]

mempool_alloc can return null in atomic case.

Signed-off-by: Denis Kirjanov <kirjanov@xxxxxxxxx>
---
diff --git a/lib/btree.c b/lib/btree.c
index 41859a8..542c904 100644
--- a/lib/btree.c
+++ b/lib/btree.c
@@ -95,7 +94,8 @@ static unsigned long *btree_node_alloc(struct btree_head *head, gfp_t gfp)
 	unsigned long *node;
 
 	node = mempool_alloc(head->mempool, gfp);
-	memset(node, 0, NODESIZE);
+	if (likely(node))
+		memset(node, 0, NODESIZE);
 	return node;
 }
 
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