Fix a use-after-free crash when returning from the alt buffer#10878
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1 commit merged intomicrosoft:mainfrom Aug 5, 2021
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Fix a use-after-free crash when returning from the alt buffer#108781 commit merged intomicrosoft:mainfrom
1 commit merged intomicrosoft:mainfrom
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## Summary of the Pull Request When switching from the alt buffer back to the main buffer, we need to copy certain cursor attributes from the one to the other. However, this copying was taking place after the alt buffer had been freed, and thus could result in the app crashing. This PR simply moves that code up a bit so it's prior to the buffer being freed. ## References PR #10843 added the code that introduced this problem. ## PR Checklist * [ ] Closes #xxx * [x] CLA signed. * [ ] Tests added/passed * [ ] Documentation updated. * [ ] Schema updated. * [ ] I've discussed this with core contributors already. If not checked, I'm ready to accept this work might be rejected in favor of a different grand plan. Issue number where discussion took place: #xxx ## Validation Steps Performed I was able to reproduce the crash when using a debug build, and confirmed that the crash no longer occurred after this PR was applied. I also checked that the cursor attributes were still being correctly copied back when returning from the alt buffer.
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Summary of the Pull Request
When switching from the alt buffer back to the main buffer, we need to copy certain cursor attributes from the one to the other. However, this copying was taking place after the alt buffer had been freed, and thus could result in the app crashing. This PR simply moves that code up a bit so it's prior to the buffer being freed.
References
PR #10843 added the code that introduced this problem.
PR Checklist
Validation Steps Performed
I was able to reproduce the crash when using a debug build, and confirmed that the crash no longer occurred after this PR was applied. I also checked that the cursor attributes were still being correctly copied back when returning from the alt buffer.