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[iOS][Android] Fix crash in Exception.CaptureDispatchState #70970

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Merged
steveisok merged 3 commits into from
Jun 22, 2022
Merged

[iOS][Android] Fix crash in Exception.CaptureDispatchState #70970

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890eb82
[iOS][Android] Fix crash in Exception.CaptureDispatchState
Jun 20, 2022
5fe7d36
Lock all of CaptureDispatchState
Jun 21, 2022
5521f8b
Marek's feedback
Jun 22, 2022
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Lock all of CaptureDispatchState
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Steve Pfister committed Jun 21, 2022
commit 5fe7d36573257cb9cde5beea60602610c8361be2
44 changes: 19 additions & 25 deletions src/mono/System.Private.CoreLib/src/System/Exception.Mono.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -68,37 +68,31 @@ internal DispatchState CaptureDispatchState()
{
MonoStackFrame[]? stackFrames;

if (_traceIPs != null)
// Make sure foreignExceptionFrames does not change at this point.
// Otherwise, the Array.Copy into combinedStackFrames can fail due to size differences
//
// See https://github.com/dotnet/runtime/issues/70081
lock(frameLock)
{
stackFrames = Diagnostics.StackTrace.get_trace(this, 0, true);
if (stackFrames.Length > 0)
stackFrames[stackFrames.Length - 1].isLastFrameFromForeignException = true;

if (foreignExceptionsFrames != null)
if (_traceIPs != null)
{
MonoStackFrame[] combinedStackFrames;
int fefLength;

// Make sure foreignExceptionFrames does not change at this point.
// Otherwise, the Array.Copy into combinedStackFrames can fail due to size differences
//
// See https://github.com/dotnet/runtime/issues/70081
lock(frameLock)
stackFrames = Diagnostics.StackTrace.get_trace(this, 0, true);
if (stackFrames.Length > 0)
stackFrames[stackFrames.Length - 1].isLastFrameFromForeignException = true;

if (foreignExceptionsFrames != null)
{
fefLength = foreignExceptionsFrames.Length;
var combinedStackFrames = new MonoStackFrame[stackFrames.Length + foreignExceptionsFrames.Length];
Array.Copy(foreignExceptionsFrames, 0, combinedStackFrames, 0, foreignExceptionsFrames.Length);
Array.Copy(stackFrames, 0, combinedStackFrames, foreignExceptionsFrames.Length, stackFrames.Length);

combinedStackFrames = new MonoStackFrame[stackFrames.Length + fefLength];
Array.Copy(foreignExceptionsFrames, 0, combinedStackFrames, 0, fefLength);
stackFrames = combinedStackFrames;
}

Array.Copy(stackFrames, 0, combinedStackFrames, fefLength, stackFrames.Length);

stackFrames = combinedStackFrames;
}
}
else
{
stackFrames = foreignExceptionsFrames;
else
{
stackFrames = foreignExceptionsFrames;
}
}

return new DispatchState(stackFrames);
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