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Be careful to not touch curses variables if cur_term is null

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Curses variables like `enter_italics_mode` are secretly defined to
dereference through the `cur_term` variable. Be sure we do not read or
write these curses variables if cur_term is NULL. See #8873, #8875.

Add a regression test.
This commit is contained in:
ridiculousfish 2022-04-16 13:25:38 -07:00
parent 1da952450f
commit bd9c6a64e3
2 changed files with 22 additions and 0 deletions
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5
src/env_dispatch.cpp
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@ -491,6 +491,11 @@ static void initialize_curses_using_fallbacks(const environment_t &vars) {
// Apply any platform-specific hacks to cur_term/
static void apply_term_hacks(const environment_t &vars) {
UNUSED(vars);
// Be careful, variables like "enter_italics_mode" are #defined to dereference through cur_term.
// See #8876.
if (!cur_term) {
return;
}
#ifdef __APPLE__
// Hack in missing italics and dim capabilities omitted from MacOS xterm-256color terminfo
// Helps Terminal.app/iTerm

17
tests/pexpects/nullterm.py Normal file
View File

@ -0,0 +1,17 @@
#!/usr/bin/env python3
import os
from pexpect_helper import SpawnedProc
# Regression test for #8873.
# fish doesn't crash if TERM is unset.
env = os.environ.copy()
env.pop("TERM", None)
sp = SpawnedProc(env=env)
sendline, expect_prompt = sp.sendline, sp.expect_prompt
expect_prompt()
sendline("set_color --italics")
expect_prompt()
sendline("set_color normal")
expect_prompt()