packet: remove length check (#1481)

ShenFeng312 · web-flow · commit 78e0387dba9f · 2023-09-20T12:55:24.000+09:00
Fix #1478
diff --git a/packets.go b/packets.go
@@ -572,12 +572,9 @@ func (mc *okHandler) readResultSetHeaderPacket() (int, error) {
 		}
 
 		// column count
-		num, _, n := readLengthEncodedInteger(data)
-		if n-len(data) == 0 {
-			return int(num), nil
-		}
-
-		return 0, ErrMalformPkt
+		num, _, _ := readLengthEncodedInteger(data)
+		// ignore remaining data in the packet. see #1478.
+		return int(num), nil
 	}
 	return 0, err
 }

Original file line number	Diff line number	Diff line change
`@@ -572,12 +572,9 @@ func (mc *okHandler) readResultSetHeaderPacket() (int, error) {`
`572`	`572`	`}`
`573`	`573`
`574`	`574`	`// column count`
`575`		`- num, _, n := readLengthEncodedInteger(data)`
`576`		`- if n-len(data) == 0 {`
`577`		`- return int(num), nil`
`578`		`- }`
`579`		`-`
`580`		`- return 0, ErrMalformPkt`
	`575`	`+ num, _, _ := readLengthEncodedInteger(data)`
	`576`	`+ // ignore remaining data in the packet. see #1478.`
	`577`	`+ return int(num), nil`
`581`	`578`	`}`
`582`	`579`	`return 0, err`
`583`	`580`	`}`