Summary

_Downstream issue: https://github.com/jeroen/mongolite/issues/269_

The R bindings are showing an ASAN error in GCC-14. The stack trace shows the problem is in jsonsl.c:

> library(mongolite)
> mongolite:::json_to_bson('{}')
jsonsl/jsonsl.c:121:19: runtime error: index 1 out of bounds for type 'jsonsl_state_st [1]'
    #0 0x7f9caa79a48d in jsonsl_new jsonsl/jsonsl.c:121
    #1 0x7f9caa74dfad in bson_json_reader_new bson/bson-json.c:2112
    #2 0x7f9caa74f297 in bson_new_from_json bson/bson-json.c:2252
    #3 0x7f9caa5513cd in R_json_to_bson /tmp/RtmpL44AuM/R.INSTALL6ae1186e640/mongolite/src/bson.c:31

Environment / How to Reproduce

We use GCC-14 on Linux and compile everything with:

  CC = gcc -fsanitize=address,undefined,bounds-strict -fno-omit-frame-pointer

And then a simple test program that invokes bson_new_from_json::

  bson_error_t err;
  bson_t b = bson_new_from_json ((uint8_t)  "{}", -1, &err);