Op 11-10-2025 om 23:00 schreef Lioric Z3:
There is a memory leak path in the preprocessor (file tccpp.c). The
traced path
was specifically within the macro argument substitution logic in
macro_arg_subst function, but other paths seem to be affected as well,
like
"expr_preprocess" where token string re/allocations are performed as well,
while holding the reallocated pointer in the stack only.
The leak occurs (on the traced path) when a syntax or token error is
encountered during the expansion of a macro argument, and the program
exits the
current scope non-locally via an assertion ("expect" assert).
The code path is:
File: tccpp.c
Function: macro_arg_subst
The specific call chain: macro_arg_subst -> tok_str_add2 ->
tok_str_realloc -> tal_realloc_impl
The error exit: An assertion or token expectation failure, such as
expect(...),
which calls tcc_error().
I made a simple testcase:
#define str(x) #
str()
And compiled with tcc_s (make sani-test creates this).
The output is:
2: error: macro parameter after '#' expected
There are no memory errors reported by the sanitized tcc compiler.
So how can I reproduce this?
Herman
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