#2774 stack-overflow on parse_assignment_expression()

[liuchenyifan]

version: gnuplot 6.1 last modified 2025-03-05
system: ubuntu 22.04

use this command to reproduce: gnutplot poc
message from ASAN:
=================================================================

==1095419==ERROR: AddressSanitizer: stack-overflow on address 0x7ffed16d4fe0 (pc 0x563f520a5484 bp 0x563f525bd920 sp 0x7ffed16d4fe0 T0)
#0 0x563f520a5484 in parse_assignment_expression /home/ubuntu/asan_program/gnuplot-main/src/parse.c:506
#1 0x563f52092540 in parse_expression /home/ubuntu/asan_program/gnuplot-main/src/parse.c:416
#2 0x563f52092540 in parse_primary_expression /home/ubuntu/asan_program/gnuplot-main/src/parse.c:664
#3 0x563f5209e3f9 in accept_multiplicative_expression /home/ubuntu/asan_program/gnuplot-main/src/parse.c:500
#4 0x563f5209e3f9 in accept_additive_expression /home/ubuntu/asan_program/gnuplot-main/src/parse.c:492
#5 0x563f5209e3f9 in accept_bitshift_expression /home/ubuntu/asan_program/gnuplot-main/src/parse.c:484
#6 0x563f520a1a96 in accept_relational_expression /home/ubuntu/asan_program/gnuplot-main/src/parse.c:476
#7 0x563f520a1a96 in accept_equality_expression /home/ubuntu/asan_program/gnuplot-main/src/parse.c:468
#8 0x563f520a1a96 in accept_AND_expression /home/ubuntu/asan_program/gnuplot-main/src/parse.c:460