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8331854: ubsan: copy.hpp:218:10: runtime error: addition of unsigned offset to 0x7fc2b4024518 overflowed to 0x7fc2b4024510 #19541

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8331854: ubsan: copy.hpp:218:10: runtime error: addition of unsigned offset to 0x7fc2b4024518 overflowed to 0x7fc2b4024510 #19541

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1f8ea85
JDK-8331854
MBaesken Jun 4, 2024
70d0910
move check after assert
MBaesken Jun 5, 2024
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1 change: 1 addition & 0 deletions src/hotspot/share/utilities/copy.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -211,6 +211,7 @@ class Copy : AllStatic {
// byte_count is in bytes to check its alignment
assert_params_ok(from, to, HeapWordSize);
assert_byte_count_ok(byte_count, HeapWordSize);
if (byte_count == 0) return;

size_t count = align_up(byte_count, HeapWordSize) >> LogHeapWordSize;
assert(from <= to || to + count <= from, "do not overwrite source data");
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