Loading of .opus Files Causes App Crash

[chrissphinx]

Steps to reproduce

Attempt to load any channel with .opus files uploaded to it. Alternatively: already be in a channel where someone posts a .opus file and the app will immediately crash.

Outcome

comp_crash.mp4

What did you expect?

Not to crash.

What happened instead?

The app crashed.

Your phone model

iPhone XS

Operating system version

iOS 15.6

Application version

Element 1.8.27

Homeserver

Synapse 1.12

Will you send logs?

Yes

[chrissphinx]

Other users on Android do not have this issue.

[pixlwave]

Hi @chrissphinx, thanks for your report. I have just tried this and was unable to reproduce it with the file I tested. Would you able to share the opus file that caused this issue (or if sensitive, another file that also causes it)?

[n8pjl]

A user on my homeserver reported this same issue (or something similar) on v1.8.27. The file in question was uploaded via the voice message on element-desktop v1.11.2 and caused the app to crash when loading that particular room (an encrypted DM in this case.) The room loads messages (including the opus file) but appears to not finish syncing before crashing very soon after. Voice messages from that user on ios did not trigger this crash, nor did messages from an android client. I have not tried to reproduce this crash as I do not have access to an iphone myself, but can continue testing later tomorrow. I cannot submit the offending file as I deleted it to determine if it was the issue, which promptly fixed the problem.

Sorry about the chaotic bug report. It's been a long day and more matrix/element issues never help.

[chrissphinx]

@pixlwave I can't actually attach the file here because .opus files are not supported by GitHub, but one of our members is rehosting the file here: https://dogspluspl.us/fastslow.opus

I can load and play this fine on Element Nightly for macOS (I'm on an M1) and also on web under Firefox on Windows. As soon as I upload this file, if it is to a room I have opened on Element on iOS, the iOS application will immediately crash. From there it exhibits same behavior as above until offending message is removed and then it works as expected again.

[b401]

Same exact issue described here but with .ogg files from voice messages.

I'm on iOS 15.6.1 (X) | Element 1.9.2 (20220831174135)

[MonsieurLanza]

Same issue here, on an unencrypted room, iOS 15.6.1, element 1.9.2 (20220831174135).
Ogg message recorded from element-web or desktop.

[dud1337]

Same exact issue described here but with .ogg files from voice messages.

I'm on iOS 15.6.1 (X) | Element 1.9.2 (20220831174135)

I've noticed some people weaponising this.

[MonsieurLanza]

While adding enough messages to the room to get the offending message out of sight, element can re-open the room. But when scrolling up in history, as soon as the voice message appears in the view, app crashes. Something wrong with the player ?