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fix(gc): correct old size calculation in block realloc.

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Using blocksPerStateByte instead of bytesPerBlock caused the old size to be underestimated for multi-block allocations, leading to data truncation on growing reallocations.
This commit is contained in:
Konstantin Sharlaimov
2026-07-13 20:57:04 +02:00
committed by Ron Evans
parent 854f91ecf2
commit b573ef3813
1 changed files with 1 additions and 1 deletions
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src/runtime/gc_blocks.go
+1 -1
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@@ -510,7 +510,7 @@ func realloc(ptr unsafe.Pointer, size uintptr) unsafe.Pointer {
lastBlock := firstBlock.findHead() lastBlock := firstBlock.findHead()
// Calculate the size of the original allocation body. // Calculate the size of the original allocation body.
oldSize := uintptr(lastBlock-firstBlock)*blocksPerStateByte + (bytesPerBlock - unsafe.Sizeof(objHeader{})) oldSize := uintptr(lastBlock-firstBlock)*bytesPerBlock + (bytesPerBlock - unsafe.Sizeof(objHeader{}))
if size <= oldSize { if size <= oldSize {
// The requested size is less than the old size. // The requested size is less than the old size.