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From 7d950f3dac6cca62635d5e4ff2af33b35372f6db Mon Sep 17 00:00:00 2001
From: Simon Ser <contact@emersion.fr>
Date: Sat, 19 Mar 2022 14:00:43 +0100
Subject: [PATCH] tinywl: don't crash when there is no keyboard
Running with WLR_BACKENDS=headless, there is no keyboard device.
Avoid crashes like so:
../tinywl/tinywl.c:136:2: runtime error: member access within null pointer of type 'struct wlr_keyboard'
../tinywl/tinywl.c:136:2: runtime error: member access within null pointer of type 'struct wlr_keyboard'
AddressSanitizer:DEADLYSIGNAL
=================================================================
==331107==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000120 (pc 0x556ed03e4e99 bp 0x7ffce834bc10 sp 0x7ffce834bbb0 T0)
==331107==The signal is caused by a READ memory access.
==331107==Hint: address points to the zero page.
#0 0x556ed03e4e99 in focus_view ../tinywl/tinywl.c:136
#1 0x556ed03eb3be in xdg_toplevel_map ../tinywl/tinywl.c:603
#2 0x7f75d6f768db in wlr_signal_emit_safe ../util/signal.c:29
#3 0x7f75d6e9cac7 in xdg_surface_role_commit ../types/xdg_shell/wlr_xdg_surface.c:315
#4 0x7f75d6eb6944 in surface_commit_state ../types/wlr_compositor.c:466
#5 0x7f75d6eb7b02 in surface_handle_commit ../types/wlr_compositor.c:523
#6 0x7f75d5714d49 (/usr/lib/libffi.so.8+0x6d49)
#7 0x7f75d5714266 (/usr/lib/libffi.so.8+0x6266)
#8 0x7f75d68cb322 (/usr/lib/libwayland-server.so.0+0xd322)
#9 0x7f75d68c65cb (/usr/lib/libwayland-server.so.0+0x85cb)
#10 0x7f75d68c91c9 in wl_event_loop_dispatch (/usr/lib/libwayland-server.so.0+0xb1c9)
#11 0x7f75d68c6d36 in wl_display_run (/usr/lib/libwayland-server.so.0+0x8d36)
#12 0x556ed03eef55 in main ../tinywl/tinywl.c:905
#13 0x7f75d5d2330f in __libc_start_call_main (/usr/lib/libc.so.6+0x2d30f)
#14 0x7f75d5d233c0 in __libc_start_main@GLIBC_2.2.5 (/usr/lib/libc.so.6+0x2d3c0)
#15 0x556ed03e46e4 in _start (/home/simon/src/wlroots/build/tinywl/tinywl+0x136e4)
---
tinywl/tinywl.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/tinywl/tinywl.c b/tinywl/tinywl.c
index dd442aac..8796e9df 100644
--- a/tinywl/tinywl.c
+++ b/tinywl/tinywl.c
@@ -130,8 +130,10 @@ static void focus_view(struct tinywl_view *view, struct wlr_surface *surface) {
* track of this and automatically send key events to the appropriate
* clients without additional work on your part.
*/
- wlr_seat_keyboard_notify_enter(seat, view->xdg_surface->surface,
- keyboard->keycodes, keyboard->num_keycodes, &keyboard->modifiers);
+ if (keyboard != NULL) {
+ wlr_seat_keyboard_notify_enter(seat, view->xdg_surface->surface,
+ keyboard->keycodes, keyboard->num_keycodes, &keyboard->modifiers);
+ }
}
static void keyboard_handle_modifiers(
--
2.36.1
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