=================================================================
==11887==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x611000000780 at pc 0x7f838f4f1266 bp 0x7ffd0e81dee0 sp 0x7ffd0e81ded8
READ of size 1 at 0x611000000780 thread T0
    #0 0x7f838f4f1265 in switch_b64_encode src/switch_utils.c:1024
    #1 0x55770f770cf5 in signtoken test/../gcs.c:80
    #2 0x55770f76b5d3 in main test/test_gcs.c:75
    #3 0x7f838eb0009a in __libc_start_main ../csu/libc-start.c:308
    #4 0x55770f76cc29 in _start (/drone/src/src/mod/applications/mod_http_cache/test/.libs/test_gcs+0xac29)

0x611000000780 is located 0 bytes to the right of 256-byte region [0x611000000680,0x611000000780)
allocated by thread T0 here:
    #0 0x7f838ff6b330 in __interceptor_malloc (/usr/lib/x86_64-linux-gnu/libasan.so.5+0xe9330)
    #1 0x55770f770c8f in signtoken test/../gcs.c:78
    #2 0x55770f76b5d3 in main test/test_gcs.c:75
    #3 0x7f838eb0009a in __libc_start_main ../csu/libc-start.c:308

SUMMARY: AddressSanitizer: heap-buffer-overflow src/switch_utils.c:1024 in switch_b64_encode
Shadow bytes around the buggy address:
  0x0c227fff80a0: fa fa fa fa fa fa fa fa 00 00 00 00 00 00 00 00
  0x0c227fff80b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c227fff80c0: 00 00 00 00 00 00 00 00 fa fa fa fa fa fa fa fa
  0x0c227fff80d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c227fff80e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0c227fff80f0:[fa]fa fa fa fa fa fa fa fd fd fd fd fd fd fd fd
  0x0c227fff8100: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x0c227fff8110: fd fd fd fd fd fd fd fd fa fa fa fa fa fa fa fa
  0x0c227fff8120: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x0c227fff8130: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x0c227fff8140: fa fa fa fa fa fa fa fa 00 00 00 00 00 00 00 00
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07 
  Heap left redzone:       fa
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  Stack after return:      f5
  Stack use after scope:   f8
  Global redzone:          f9
  Global init order:       f6
  Poisoned by user:        f7
  Container overflow:      fc
  Array cookie:            ac
  Intra object redzone:    bb
  ASan internal:           fe
  Left alloca redzone:     ca
  Right alloca redzone:    cb
==11887==ABORTING