6ffca22602
If dst slice length is zero in makeslicecopy then the called mallocgc is using a fast path to only return a pointer to runtime.zerobase. There may be no heapBits for that address readable by bulkBarrierPreWriteSrcOnly which will cause a panic. Protect against this by not calling bulkBarrierPreWriteSrcOnly if there is nothing to copy. This is the case for all cases where the length of the destination slice is zero. runtime.growslice and runtime.typedslicecopy have fast paths that do not call bulkBarrierPreWrite for zero copy lengths either. Fixes #38929 Change-Id: I78ece600203a0a8d24de5b6c9eef56f605d44e99 Reviewed-on: https://go-review.googlesource.com/c/go/+/232800 Reviewed-by: Keith Randall <khr@golang.org> |
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