Fix panics found via go-fuzz

CHANGELOG.md

@@ -17,6 +17,7 @@
 - [#3414](https://github.com/influxdb/influxdb/issues/3414): Shard mappers perform query re-writing
 - [#3525](https://github.com/influxdb/influxdb/pull/3525): check if fields are valid during parse time.
 - [#3511](https://github.com/influxdb/influxdb/issues/3511): Sending a large number of tag causes panic
+- [#3288](https://github.com/influxdb/influxdb/issues/3288): Run go fuzz on the line-protocol input
 
 ## v0.9.2 [2015-07-24]
 

tsdb/points.go

@@ -117,7 +117,14 @@ func ParsePointsWithPrecision(buf []byte, defaultTime time.Time, precision strin
 		}
 
 		// lines which start with '#' are comments
-		if start := skipWhitespace(block, 0); block[start] == '#' {
+		start := skipWhitespace(block, 0)
+
+		// If line is all whitespace, just skip it
+		if start >= len(block) {
+			continue
+		}
+
+		if block[start] == '#' {
 			continue
 		}
 
@@ -222,6 +229,10 @@ func scanKey(buf []byte, i int) (int, []byte, error) {
 		}
 
 		if buf[i] == '=' {
+			if i-1 < 0 || i-2 < 0 {
+				return i, buf[start:i], fmt.Errorf("missing tag name")
+			}
+
 			// Check for "cpu,=value" but allow "cpu,a\,=value"
 			if buf[i-1] == ',' && buf[i-2] != '\\' {
 				return i, buf[start:i], fmt.Errorf("missing tag name")

tsdb/points_test.go

@@ -147,7 +147,29 @@ func TestParsePointNoValue(t *testing.T) {
 	}
 
 	if exp := 0; len(pts) != exp {
-		t.Errorf(`ParsePoints("%s") len mismatch. got %v, exp %vr`, "", len(pts), exp)
+		t.Errorf(`ParsePoints("%s") len mismatch. got %v, exp %v`, "", len(pts), exp)
+	}
+}
+
+func TestParsePointWhitespaceValue(t *testing.T) {
+	pts, err := tsdb.ParsePointsString(" ")
+	if err != nil {
+		t.Errorf(`ParsePoints("%s") mismatch. got %v, exp nil`, "", err)
+	}
+
+	if exp := 0; len(pts) != exp {
+		t.Errorf(`ParsePoints("%s") len mismatch. got %v, exp %v`, "", len(pts), exp)
+	}
+}
+
+func TestParsePointSingleEquals(t *testing.T) {
+	pts, err := tsdb.ParsePointsString("=")
+	if err == nil {
+		t.Errorf(`ParsePoints("%s") mismatch. expected error`, "=")
+	}
+
+	if exp := 0; len(pts) != exp {
+		t.Errorf(`ParsePoints("%s") len mismatch. got %v, exp %v`, "", len(pts), exp)
 	}
 }