net: slice bounds out of range #61060
Description
What version of Go are you using (go version)?
$ go version go version go1.21rc2 darwin/arm64
Does this issue reproduce with the latest release?
It occurs with 1.21, 1.20, and earlier version too (untested)
What operating system and processor architecture are you using (go env)?
go env Output
$ go env darwin/amd64
What did you do?
Probably try to resolve an IP
What did you expect to see?
It resolve
What did you see instead?
panic: runtime error: slice bounds out of range [54:45]
goroutine 65 [running]:
internal/poll.(*FD).Write(0xc0001f6080, {0xc00015e002, 0x2d, 0x200})
/opt/homebrew/Cellar/go/1.20.3/libexec/src/internal/poll/fd_unix.go:383 +0x49c
net.(*netFD).Write(0xc0001f6080, {0xc00015e002, 0x2d, 0x200})
/opt/homebrew/Cellar/go/1.20.3/libexec/src/net/fd_posix.go:96 +0x48
net.(*conn).Write(0xc0001200e0, {0xc00015e002, 0x2d, 0x200})
/opt/homebrew/Cellar/go/1.20.3/libexec/src/net/net.go:195 +0x88
net.dnsPacketRoundTrip({_, _}, _, {{{0x6d, 0x79, 0x69, 0x70, 0x2e, 0x6f, 0x70, ...}, ...}, ...}, ...)
/opt/homebrew/Cellar/go/1.20.3/libexec/src/net/dnsclient_unix.go:102 +0x88
net.(*Resolver).exchange(_, {_, _}, {_, _}, {{{0x6d, 0x79, 0x69, 0x70, 0x2e, ...}, ...}, ...}, ...)
/opt/homebrew/Cellar/go/1.20.3/libexec/src/net/dnsclient_unix.go:187 +0x3ec
net.(*Resolver).tryOneName(_, {_, _}, _, {_, _}, _)
/opt/homebrew/Cellar/go/1.20.3/libexec/src/net/dnsclient_unix.go:277 +0x40c
net.(*Resolver).goLookupIPCNAMEOrder.func3.1(0x1c?)
/opt/homebrew/Cellar/go/1.20.3/libexec/src/net/dnsclient_unix.go:653 +0xa0
created by net.(*Resolver).goLookupIPCNAMEOrder.func3
/opt/homebrew/Cellar/go/1.20.3/libexec/src/net/dnsclient_unix.go:652 +0x244