#2775 stack-overflow on gp_alloc()

[liuchenyifan]

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

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

=================================================================
==1106554==ERROR: AddressSanitizer: stack-overflow on address 0x7ffcb9944ff8 (pc 0x7fc0105fd6a8 bp 0x000000000001 sp 0x7ffcb9945000 T0)
#0 0x7fc0105fd6a8 in __asan::GetCurrentThread() ../../../../src/libsanitizer/asan/asan_thread.cpp:421
#1 0x7fc0105fadc0 in __sanitizer::BufferedStackTrace::UnwindImpl(unsigned long, unsigned long, void, bool, unsigned int) ../../../../src/libsanitizer/asan/asan_stack.cpp:63
#2 0x7fc0105ee89c in __sanitizer::BufferedStackTrace::Unwind(unsigned long, unsigned long, void, bool, unsigned int) ../../../../src/libsanitizer/sanitizer_common/sanitizer_stacktrace.h:122
#3 0x7fc0105ee89c in __interceptor_malloc ../../../../src/libsanitizer/asan/asan_malloc_linux.cpp:145
#4 0x55e41917fde5 in gp_alloc /home/ubuntu/asan_program/gnuplot-main/src/alloc.c:56
#5 0x55e41964d6ee in stylefont /home/ubuntu/asan_program/gnuplot-main/src/term.c:2600
#6 0x55e4197432a2 in enhanced_recursion /home/ubuntu/asan_program/gnuplot-main/src/term.c:2410
#7 0x55e4197432cf in enhanced_recursion /home/ubuntu/asan_program/gnuplot-main/src/term.c:2413
#8 0x55e4197432cf in enhanced_recursion /home/ubuntu/asan_program/gnuplot-main/src/term.c:2413
#9 0x55e4197432cf in enhanced_recursion /home/ubuntu/asan_program/gnuplot-main/src/term.c:2413
#10 0x55e4197432cf in enhanced_recursion /home/ubuntu/asan_program/gnuplot-main/src/term.c:2413