Fix CodeQL warnings

internal/internal.go

@@ -3,6 +3,7 @@ package internal
 import (
 	"fmt"
 	"io"
+	"math"
 	"os"
 	"regexp"
 	"strconv"
@@ -159,8 +160,11 @@ func ParseSnapshotPath(s string) (index int, err error) {
 		return 0, fmt.Errorf("invalid snapshot path")
 	}
 
-	i64, _ := strconv.ParseUint(a[1], 16, 64)
-	return int(i64), nil
+	i32, _ := strconv.ParseUint(a[1], 16, 32)
+	if i32 > math.MaxInt32 {
+		return 0, fmt.Errorf("index too large in snapshot path %q", s)
+	}
+	return int(i32), nil
 }
 
 var snapshotPathRegex = regexp.MustCompile(`^([0-9a-f]{8})\.snapshot\.lz4$`)
@@ -172,9 +176,15 @@ func ParseWALSegmentPath(s string) (index int, offset int64, err error) {
 		return 0, 0, fmt.Errorf("invalid wal segment path")
 	}
 
-	i64, _ := strconv.ParseUint(a[1], 16, 64)
-	off64, _ := strconv.ParseUint(a[2], 16, 64)
-	return int(i64), int64(off64), nil
+	i32, _ := strconv.ParseUint(a[1], 16, 32)
+	if i32 > math.MaxInt32 {
+		return 0, 0, fmt.Errorf("index too large in wal segment path %q", s)
+	}
+	off64, _ := strconv.ParseInt(a[2], 16, 64)
+	if off64 > math.MaxInt64 {
+		return 0, 0, fmt.Errorf("offset too large in wal segment path %q", s)
+	}
+	return int(i32), int64(off64), nil
 }
 
 var walSegmentPathRegex = regexp.MustCompile(`^([0-9a-f]{8})\/([0-9a-f]{8})\.wal\.lz4$`)