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Fix BigInteger bitwise operators on certain negative numbers #109684

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merged 2 commits into from
Nov 13, 2024

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Rob-Hague
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@dotnet-policy-service dotnet-policy-service bot added the community-contribution Indicates that the PR has been added by a community member label Nov 10, 2024
@Rob-Hague
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An alternative or follow-up could be to remove this constructor and replace the 3 uses with calls to the public ROS<byte> constructor, e.g.

diff --git a/src/libraries/System.Runtime.Numerics/src/System/Numerics/BigInteger.cs b/src/libraries/System.Runtime.Numerics/src/System/Numerics/BigInteger.cs
index b3355ff6867..4a0d53e6be2 100644
--- a/src/libraries/System.Runtime.Numerics/src/System/Numerics/BigInteger.cs
+++ b/src/libraries/System.Runtime.Numerics/src/System/Numerics/BigInteger.cs
@@ -2476,7 +2476,7 @@ private static BigInteger Subtract(ReadOnlySpan<uint> leftBits, int leftSign, Re
             if (rightBufferFromPool != null)
                 ArrayPool<uint>.Shared.Return(rightBufferFromPool);

-            var result = new BigInteger(z);
+            var result = new BigInteger(MemoryMarshal.AsBytes(z));

             if (resultBufferFromPool != null)
                 ArrayPool<uint>.Shared.Return(resultBufferFromPool);

@huoyaoyuan
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Duplicate of #105456

@tannergooding
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Merged #105456

Will still take this PR for the explicit regression test and typo fix.

@jeffhandley
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@tannergooding Once this is merged, do you want to cherry-pick it into #109732 for the backport too so we take this new test with the fix?

@tannergooding
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Can do.

@tannergooding tannergooding merged commit d3d0fce into dotnet:main Nov 13, 2024
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tannergooding added a commit that referenced this pull request Nov 13, 2024
Co-authored-by: Tanner Gooding <tagoo@outlook.com>
@Rob-Hague Rob-Hague deleted the bigintops branch November 13, 2024 17:36
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BigInteger correctness regression from .NET 8
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