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input: do not crash if sctofunc() returns NULL

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This fixes a regression introduced by commit 54103d8e: a crash that
can be triggered by running 'nano --restrict' and pressing <Insert>.

This addresses https://bugzilla.redhat.com/1558532.
This commit is contained in:
Kamil Dudka 2018-03-20 16:49:34 +01:00 committed by Benno Schulenberg
parent 3e5b0ea5fd
commit b830a7dd38
1 changed files with 11 additions and 5 deletions
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16
src/nano.c
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@ -1727,9 +1727,12 @@ int do_input(bool allow_funcs)
if (shortcut == NULL)
pletion_line = NULL;
else {
if (ISSET(VIEW_MODE) && !sctofunc(shortcut)->viewok) {
print_view_warning();
return ERR;
if (ISSET(VIEW_MODE)) {
const subnfunc *f = sctofunc(shortcut);
if (f && !f->viewok) {
print_view_warning();
return ERR;
}
}
/* If the function associated with this shortcut is
@ -1801,8 +1804,11 @@ int do_input(bool allow_funcs)
wrap_reset();
#endif
#ifdef ENABLE_COLOR
if (!refresh_needed && !sctofunc(shortcut)->viewok)
check_the_multis(openfile->current);
if (!refresh_needed) {
const subnfunc *f = sctofunc(shortcut);
if (f && !f->viewok)
check_the_multis(openfile->current);
}
#endif
if (!refresh_needed && (shortcut->func == do_delete ||
shortcut->func == do_backspace))