commit 23420c24937a8899bf1cfb900b9a5155b6f924ae
from: mmnmnnmnmm <45293514+mmnmnnmnmm@users.noreply.github.com>
via: Dan Cross <crossd@gmail.com>
date: Tue Jul 26 16:09:57 2022 UTC

deroff: fix out-of-bounds access if runes above 0X80 are inside EQ clauses

commit - a2422a89c5ef6cffd71599aaa0af47423eb5a7f9
commit + 23420c24937a8899bf1cfb900b9a5155b6f924ae
blob - 0ad083759d94390241830c13a3e075388f38457f
blob + 4c48989c92f22c253311eb113ac55a5ce6db1f7c
--- src/cmd/deroff.c
+++ src/cmd/deroff.c
@@ -745,7 +745,7 @@ eqn(void)
 		}
 		if(c != '\n')
 			while(C1 != '\n') {
-				if(chars[c] == PUNCT)
+				if(charclass(c) == PUNCT)
 					last = c;
 				else
 				if(c != ' ')