1642480 - Crash in [@ mozilla::a11y::nsAccUtils::IsARIALive]

Status: RESOLVED FIXED

(Core :: Disability Access APIs, defect, P1)

Description

[Gabriele Svelto [:gsvelto]]

This bug is for crash report bp-e41ca7aa-1fcd-4d8c-a003-d66b20200531.

Top 10 frames of crashing thread:

0 xul.dll static mozilla::a11y::nsAccUtils::IsARIALive accessible/base/nsAccUtils.cpp:477
1 xul.dll mozilla::a11y::Accessible::HandleAccEvent accessible/generic/Accessible.cpp:833
2 xul.dll mozilla::a11y::AccessibleWrap::HandleAccEvent accessible/windows/msaa/AccessibleWrap.cpp:1161
3 xul.dll static nsEventShell::FireEvent accessible/base/nsEventShell.cpp:43
4 xul.dll mozilla::a11y::NotificationController::ProcessMutationEvents accessible/base/NotificationController.cpp:480
5 xul.dll mozilla::a11y::NotificationController::WillRefresh accessible/base/NotificationController.cpp:836
6 xul.dll nsRefreshDriver::Tick layout/base/nsRefreshDriver.cpp:1994
7 xul.dll mozilla::RefreshDriverTimer::TickRefreshDrivers layout/base/nsRefreshDriver.cpp:350
8 xul.dll mozilla::RefreshDriverTimer::Tick layout/base/nsRefreshDriver.cpp:367
9 xul.dll mozilla::VsyncRefreshDriverTimer::RefreshDriverVsyncObserver::TickRefreshDriver layout/base/nsRefreshDriver.cpp:745

This is a NULL pointer dereference, the oldest buildid for this crash is 20200512140204. Note that there's a single non-nightly crash but it seems unrelated.

Comment 1

[James Teh [:Jamie]]

Attachment: Bug 1642480: Null check content in nsAccUtils::IsARIALive.

Comment 2

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/3260905f68d1
Null check content in nsAccUtils::IsARIALive. r=MarcoZ

Comment 3

[Cristian Brindusan [:cbrindusan]]

https://hg.mozilla.org/mozilla-central/rev/3260905f68d1

Comment 4

[James Teh [:Jamie]]

Comment on attachment 9153312 [details]
Bug 1642480: Null check content in nsAccUtils::IsARIALive.

Beta/Release Uplift Approval Request

• User impact if declined: Crashes.
• Is this code covered by automated tests?: No
• Has the fix been verified in Nightly?: No
• Needs manual test from QE?: No
• If yes, steps to reproduce:
• List of other uplifts needed: None
• Risk to taking this patch: Low
• Why is the change risky/not risky? (and alternatives if risky): Simple null check.
• String changes made/needed:

Comment 5

[Julien Cristau [:jcristau]]

Comment on attachment 9153312 [details]
Bug 1642480: Null check content in nsAccUtils::IsARIALive.

a11y crash fix for 78.0b3

Comment 6

[Julien Cristau [:jcristau]]

https://hg.mozilla.org/releases/mozilla-beta/rev/5e90387e27ce