run-emitter-test-suite: negative-size-param in get_tag/memcpy

[251]

In get_tag:

libyaml/tests/run-emitter-test-suite.c

Line 224 in f8f760f

if ((start = strchr(line, '<')) == NULL)

probably the ordering of start/end should be checked before memcpy:

$ printf '+SEQ><\n' > A
$ yaml-0.2.5/bin/run-emitter-test-suite "--directive" "1.1" "--flow" "keep" "A"
==1542==ERROR: AddressSanitizer: negative-size-param: (size=-2)

gdb backtrace:

#17 0x0000000000500952 in get_tag (line=0x7fffffffd590 "+SEQ><", tag=0x7fffffffdf00 "\300\220^") at yaml-0.2.5/tests/run-emitter-test-suite.c:228
#18 0x0000000000500522 in main (argc=6, argv=0x7fffffffe348) at yaml-0.2.5/tests/run-emitter-test-suite.c:125

(found by KLEE)