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Fix runtime panic

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This commit is contained in:
Alirie Gray 2019-05-29 13:33:44 -07:00 committed by Cameron Sparr
parent 3eec4c7c0d
commit d596e7045d
1 changed files with 4 additions and 2 deletions

6
ping.go
View File

@ -442,7 +442,7 @@ func (p *Pinger) processPacket(recv *packet) error {
var proto int var proto int
if p.ipv4 { if p.ipv4 {
if p.network == "ip" { if p.network == "ip" {
bytes = ipv4Payload(recv.bytes) bytes = ipv4Payload(recv)
} else { } else {
bytes = recv.bytes bytes = recv.bytes
} }
@ -591,11 +591,13 @@ func byteSliceOfSize(n int) []byte {
return b return b
} }
func ipv4Payload(b []byte) []byte { func ipv4Payload(recv *packet) []byte {
b := recv.bytes
if len(b) < ipv4.HeaderLen { if len(b) < ipv4.HeaderLen {
return b return b
} }
hdrlen := int(b[0]&0x0f) << 2 hdrlen := int(b[0]&0x0f) << 2
recv.nbytes -= hdrlen
return b[hdrlen:] return b[hdrlen:]
} }