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Resolves: #1558532 - fix crash of 'nano --restrict when <Insert> is pressed

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This commit is contained in:
Kamil Dudka 2018-03-21 13:12:49 +01:00
parent c9ebb7c245
commit 2f880d0807
2 changed files with 154 additions and 1 deletions
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147
0001-nano-2.9.4-restrict-crash.patch Normal file
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@ -0,0 +1,147 @@
From 4cdad8299f605e8b0527391a49311786e0bca35c Mon Sep 17 00:00:00 2001
From: Kamil Dudka <kdudka@redhat.com>
Date: Tue, 20 Mar 2018 16:49:34 +0100
Subject: [PATCH 1/2] input: do not crash if sctofunc() returns NULL
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.
Upstream-commit: b830a7dd384495fb9b882f866b26948025abe136
Signed-off-by: Kamil Dudka <kdudka@redhat.com>
---
src/nano.c | 16 +++++++++++-----
1 file changed, 11 insertions(+), 5 deletions(-)
diff --git a/src/nano.c b/src/nano.c
index ad95925..e7b6d62 100644
--- a/src/nano.c
+++ b/src/nano.c
@@ -1712,9 +1712,12 @@ 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
@@ -1787,8 +1790,11 @@ 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))
--
2.14.3
From 25a02d16fc59bbe88cdc51922534436b20187a3d Mon Sep 17 00:00:00 2001
From: Benno Schulenberg <bensberg@telfort.nl>
Date: Tue, 20 Mar 2018 19:56:03 +0100
Subject: [PATCH 2/2] tweaks: factor out the check for 'viewok' into its own
function
And also prevent a theoretical crash for restricted prompt functions.
Upstream-commit: 8b8c6bb818b21b9c7fcf7481df7154745b4aad41
Signed-off-by: Kamil Dudka <kdudka@redhat.com>
---
src/nano.c | 24 +++++++++++++-----------
src/prompt.c | 2 +-
src/proto.h | 1 +
3 files changed, 15 insertions(+), 12 deletions(-)
diff --git a/src/nano.c b/src/nano.c
index e7b6d62..c39622b 100644
--- a/src/nano.c
+++ b/src/nano.c
@@ -1621,6 +1621,14 @@ int do_mouse(void)
}
#endif /* ENABLE_MOUSE */
+/* Return TRUE when the given shortcut is valid in view mode. */
+bool okay_for_view(const sc *shortcut)
+{
+ const subnfunc *func = sctofunc(shortcut);
+
+ return (func && func->viewok);
+}
+
/* Read in a keystroke. Act on the keystroke if it is a shortcut or a toggle;
* otherwise, insert it into the edit buffer. If allow_funcs is FALSE, don't
* do anything with the keystroke -- just return it. */
@@ -1712,12 +1720,9 @@ int do_input(bool allow_funcs)
if (shortcut == NULL)
pletion_line = NULL;
else {
- if (ISSET(VIEW_MODE)) {
- const subnfunc *f = sctofunc(shortcut);
- if (f && !f->viewok) {
- print_view_warning();
- return ERR;
- }
+ if (ISSET(VIEW_MODE) && !okay_for_view(shortcut)) {
+ print_view_warning();
+ return ERR;
}
/* If the function associated with this shortcut is
@@ -1790,11 +1795,8 @@ int do_input(bool allow_funcs)
wrap_reset();
#endif
#ifdef ENABLE_COLOR
- if (!refresh_needed) {
- const subnfunc *f = sctofunc(shortcut);
- if (f && !f->viewok)
- check_the_multis(openfile->current);
- }
+ if (!refresh_needed && !okay_for_view(shortcut))
+ check_the_multis(openfile->current);
#endif
if (!refresh_needed && (shortcut->func == do_delete ||
shortcut->func == do_backspace))
diff --git a/src/prompt.c b/src/prompt.c
index e8fbbc0..8ec74fd 100644
--- a/src/prompt.c
+++ b/src/prompt.c
@@ -171,7 +171,7 @@ int do_statusbar_input(bool *finished)
/* Handle any other shortcut in the current menu, setting finished
* to TRUE to indicate that we're done after running or trying to
* run its associated function. */
- if (!ISSET(VIEW_MODE) || sctofunc(shortcut)->viewok)
+ if (!ISSET(VIEW_MODE) || okay_for_view(shortcut))
shortcut->func();
*finished = TRUE;
}
diff --git a/src/proto.h b/src/proto.h
index 86f53d7..5530a90 100644
--- a/src/proto.h
+++ b/src/proto.h
@@ -441,6 +441,7 @@ void disable_flow_control(void);
void enable_flow_control(void);
void terminal_init(void);
void unbound_key(int code);
+bool okay_for_view(const sc *shortcut);
int do_input(bool allow_funcs);
void do_output(char *output, size_t output_len, bool allow_cntrls);
--
2.14.3

8
nano.spec
View File

@ -1,7 +1,7 @@
Summary: A small text editor
Name: nano
Version: 2.9.4
Release: 1%{?dist}
Release: 2%{?dist}
License: GPLv3+
URL: https://www.nano-editor.org
Source: https://www.nano-editor.org/dist/v2.9/%{name}-%{version}.tar.gz
@ -19,6 +19,9 @@ Conflicts: filesystem < 3
Requires(post): /sbin/install-info
Requires(preun): /sbin/install-info
# fix crash of 'nano --restrict when <Insert> is pressed (#1558532)
Patch1: 0001-nano-2.9.4-restrict-crash.patch
%description
GNU nano is a small and friendly text editor.
@ -80,6 +83,9 @@ exit 0
%{_datadir}/nano
%changelog
* Wed Mar 21 2018 Kamil Dudka <kdudka@redhat.com> - 2.9.4-2
- fix crash of 'nano --restrict when <Insert> is pressed (#1558532)
* Thu Mar 08 2018 Kamil Dudka <kdudka@redhat.com> - 2.9.4-1
- new upstream release