Fix buffer bounding

ghost · ghost · commit d42eac850716 · 2020-05-24T13:52:37.000+08:00
fix #116
diff --git a/proxy/socks/udp.go b/proxy/socks/udp.go
@@ -67,10 +67,10 @@ func (h *udpHandler) fetchUDPInput(conn core.UDPConn, input net.PacketConn) {
 		if err != nil {
 			return
 		}
-		if len(buf) < 3 {
+		if n < 3 {
 			return
 		}
-		addr := SplitAddr(buf[3:])
+		addr := SplitAddr(buf[3:n])
 		if addr == nil {
 			return
 		}

Original file line number	Diff line number	Diff line change
`@@ -67,10 +67,10 @@ func (h *udpHandler) fetchUDPInput(conn core.UDPConn, input net.PacketConn) {`
`67`	`67`	`if err != nil {`
`68`	`68`	`return`
`69`	`69`	`}`
`70`		`- if len(buf) < 3 {`
	`70`	`+ if n < 3 {`
`71`	`71`	`return`
`72`	`72`	`}`
`73`		`- addr := SplitAddr(buf[3:])`
	`73`	`+ addr := SplitAddr(buf[3:n])`
`74`	`74`	`if addr == nil {`
`75`	`75`	`return`
`76`	`76`	`}`