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module/sway-xkb: don’t add the “same” device multiple times

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Not sure if Sway bug or not, but we’ve seen Sway presenting multiple
input devices with the exact same ID (and nothing else differentiating
them).

This caused a crash in the sway-xkb module, since we didn’t check if
we were already tracking the device, and thus bumped the
“num_existing_inputs” variable multiple times for the same input
object.

This lead to a content() returning an array with uninitialized
elements, and thus a crash.

Closes #229
This commit is contained in:
Daniel Eklöf 2022-10-04 21:09:43 +02:00
parent 6ed576c719
commit 028011a816
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GPG key ID: 5BBD4992C116573F
2 changed files with 12 additions and 1 deletions
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3
CHANGELOG.md
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@ -115,6 +115,8 @@
* network: missing SSID (recent kernels, or possibly wireless drivers,
no longer provide the SSID in the `NL80211_CMD_NEW_STATION`
response) ([#226][226]).
* sway-xkb: crash when compositor presents multiple inputs with
identical IDs ([#229][229]).
[169]: https://codeberg.org/dnkl/yambar/issues/169
[172]: https://codeberg.org/dnkl/yambar/issues/172
@ -123,6 +125,7 @@
[198]: https://codeberg.org/dnkl/yambar/issues/198
[221]: https://codeberg.org/dnkl/yambar/issues/221
[226]: https://codeberg.org/dnkl/yambar/issues/226
[229]: https://codeberg.org/dnkl/yambar/issues/229
### Security

10
modules/sway-xkb.c
View file

@ -67,6 +67,7 @@ content(struct module *mod)
mtx_lock(&mod->lock);
assert(m->num_existing_inputs <= m->num_inputs);
struct exposable *particles[max(m->num_existing_inputs, 1)];
for (size_t i = 0, j = 0; i < m->num_inputs; i++) {
@ -120,9 +121,12 @@ handle_input_reply(int type, const struct json_object *json, void *_mod)
struct input *input = NULL;
for (size_t i = 0; i < m->num_inputs; i++) {
struct input *maybe_input = &m->inputs[i];
if (strcmp(maybe_input->identifier, id) == 0) {
if (strcmp(maybe_input->identifier, id) == 0 && !maybe_input->exists)
{
input = maybe_input;
LOG_DBG("adding: %s", id);
mtx_lock(&mod->lock);
input->exists = true;
m->num_existing_inputs++;
@ -209,6 +213,8 @@ handle_input_event(int type, const struct json_object *json, void *_mod)
if (is_removed) {
if (input->exists) {
LOG_DBG("removing: %s", id);
mtx_lock(&mod->lock);
input->exists = false;
m->num_existing_inputs--;
@ -220,6 +226,8 @@ handle_input_event(int type, const struct json_object *json, void *_mod)
if (is_added) {
if (!input->exists) {
LOG_DBG("adding: %s", id);
mtx_lock(&mod->lock);
input->exists = true;
m->num_existing_inputs++;