panic: runtime error: slice bounds out of range [:-99]

[jehoshua7]

Version 1.0.0-1

The mobile phone was attached okay and transferring files. Then there were problems with navigating empty paths, and these messages

goroutine 6 [running]:
github.com/hanwen/go-mtpfs/mtp.(*Device).fetchPacket(0xc00012c280, 0xc000494000, 0x200, 0x200, 0xc000502070, 0x2000, 0x41b91e, 0x203000, 0xaa, 0x6c1578)
github.com/hanwen/go-mtpfs/mtp/mtp.go:231 +0x2a5
github.com/hanwen/go-mtpfs/mtp.(*Device).runTransaction(0xc00012c280, 0xc000151d80, 0xc000151cd0, 0x5c1940, 0xc000364000, 0x0, 0x0, 0x0, 0xc000151c48, 0x4114b8)
github.com/hanwen/go-mtpfs/mtp/mtp.go:345 +0x1e5
github.com/hanwen/go-mtpfs/mtp.(*Device).RunTransaction(0xc00012c280, 0xc000151d80, 0xc000151cd0, 0x5c1940, 0xc000364000, 0x0, 0x0, 0x0, 0xc000080000, 0x0)
github.com/hanwen/go-mtpfs/mtp/mtp.go:295 +0x97
github.com/hanwen/go-mtpfs/mtp.(*Device).GetData(0xc00012c280, 0xc000151d80, 0x566fe0, 0xc000492000, 0x18, 0x7f7f4148a7d0)
github.com/hanwen/go-mtpfs/mtp/ops.go:55 +0xac
github.com/hanwen/go-mtpfs/mtp.(*Device).GetStorageInfo(...)
github.com/hanwen/go-mtpfs/mtp/ops.go:149
github.com/hanwen/go-mtpfs/fs.(*mtpNodeImpl).Statfs(0xc0003046e0, 0x5c3d20, 0xc000216020, 0xc000090108, 0x0)
github.com/hanwen/go-mtpfs/fs/fs.go:240 +0xf7
github.com/hanwen/go-fuse/fs.(*rawBridge).StatFs(0xc00014c000, 0xc00008e000, 0xc000090198, 0xc000090108, 0xc000090198)
github.com/hanwen/go-fuse/fs/bridge.go:982 +0xfd
github.com/hanwen/go-fuse/fuse.doStatFs(0xc00012e160, 0xc000090000)
github.com/hanwen/go-fuse/fuse/opcode.go:427 +0x74
github.com/hanwen/go-fuse/fuse.(*Server).handleRequest(0xc00012e160, 0xc000090000, 0xc000000000)
github.com/hanwen/go-fuse/fuse/server.go:472 +0x2b6
github.com/hanwen/go-fuse/fuse.(*Server).loop(0xc00012e160, 0x0)
github.com/hanwen/go-fuse/fuse/server.go:445 +0x198
github.com/hanwen/go-fuse/fuse.(*Server).Serve(0xc00012e160)
github.com/hanwen/go-fuse/fuse/server.go:367 +0x45
created by github.com/hanwen/go-fuse/fs.Mount
github.com/hanwen/go-fuse/fs/mount.go:32 +0x105

[AdamMajer]

I see similar crashes with Samsung phone that makes it impossible to transfer files.

Switched to https://github.com/JasonFerrara/jmtpfs and it just worked

[hanwen]

	fetchPacketSize := d.fetchMaxPacketSize()
	data := make([]byte, fetchPacketSize)
	h := &usbBulkHeader{}
	rest, err := d.fetchPacket(data[:], h)
...

func (d *Device) fetchPacket(dest []byte, header *usbBulkHeader) (rest []byte, err error) {
	n, err := d.h.BulkTransfer(d.fetchEP, dest[:d.fetchMaxPacketSize()], d.Timeout)
	if n > 0 {

..


func (d *Device) fetchMaxPacketSize() int {
	return d.dev.GetMaxPacketSize(d.fetchEP)
}
...

func (d *Device) GetMaxPacketSize(endpoint byte) int {
	return int(C.libusb_get_max_packet_size(d.me(), C.uchar(endpoint)))
}

See https://sourcegraph.com/github.com/OneOfEleven/NanoVNA-App/-/blob/libusb.cpp?L772 , LIBUSB_ERROR_OTHER is -99.

[hanwen]

I assume there was some error before the crash that caused the USB connection to break before.