fix(pkg/ring): return nil on inconsistent access to buffer rings elements

mmeloni · mmeloni · commit a4001930c73a · 2020-06-09T12:02:19.000+02:00
diff --git a/pkg/ring/buffer.go b/pkg/ring/buffer.go
@@ -49,6 +49,9 @@ func (r *ringBuffer) Get(i uint64) interface{} {
 	if i < r.head {
 		return nil
 	}
+	if i >= r.tail {
+		return nil
+	}
 	return r.data[i%r.size]
 }
 

Original file line number	Diff line number	Diff line change
`@@ -49,6 +49,9 @@ func (r *ringBuffer) Get(i uint64) interface{} {`
`49`	`49`	`if i < r.head {`
`50`	`50`	`return nil`
`51`	`51`	`}`
	`52`	`+ if i >= r.tail {`
	`53`	`+ return nil`
	`54`	`+ }`
`52`	`55`	`return r.data[i%r.size]`
`53`	`56`	`}`
`54`	`57`