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fix memory leak of MMacro::name on macro undefining #67

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fix memory leak of MMacro::name on macro undefining #67

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4 changes: 4 additions & 0 deletions asm/preproc.c
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Original file line number Diff line number Diff line change
Expand Up @@ -3318,6 +3318,7 @@ static bool parse_mmacro_spec(Token *tline, MMacro *def, const char *directive)
#if 0
def->prev = NULL;
#endif
nasm_assert(!def->name);
def->name = dup_text(tline);
def->plus = false;
def->nolist = 0;
Expand Down Expand Up @@ -4615,12 +4616,14 @@ static int do_directive(Token *tline, Token **output)
if (!mmac_p) {
/* No such macro */
free_tlist(spec.dlist);
nasm_free(spec.name);
break;
}

/* Check the macro to be undefined is not being expanded */
list_for_each(l, istk->expansion) {
if (l->finishes == *mmac_p) {
nasm_free(spec.name);
nasm_nonfatal("`%%unmacro' can't undefine the macro being expanded");
/*
* Do not release the macro instance to avoid using the freed
Expand All @@ -4644,6 +4647,7 @@ static int do_directive(Token *tline, Token **output)
}
}
free_tlist(spec.dlist);
nasm_free(spec.name);
break;
}

Expand Down