mtp_fuzzer: Bug fix

Updated MtpMockHandle to prevent OOB read. The buffer size check in read() is updated to consider remaining number of bytes instead of total number of bytes.

Bug: b/319146213
Test: ./mtp_fuzzer clusterfuzz-testcase-minimized-mtp_fuzzer-6063056382656512

Change-Id: Ic3850f71b63fbf57139f4a26f1676ebb5f0048ac
1 file changed