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8333639: ubsan: cppVtables.cpp:81:55: runtime error: index 14 out of bounds for type 'long int [1]'

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Reviewed-by: aboldtch, mbaesken, kbarrett
This commit is contained in:
Martin Doerr 2024-06-18 06:48:26 +00:00
parent e95f092862
commit 0199fee431
1 changed files with 6 additions and 8 deletions
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14
src/hotspot/share/cds/cppVtables.cpp
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@ -66,19 +66,17 @@
class CppVtableInfo { class CppVtableInfo {
intptr_t _vtable_size; intptr_t _vtable_size;
intptr_t _cloned_vtable[1]; intptr_t _cloned_vtable[1]; // Pseudo flexible array member.
static size_t cloned_vtable_offset() { return offset_of(CppVtableInfo, _cloned_vtable); }
public: public:
static int num_slots(int vtable_size) {
return 1 + vtable_size; // Need to add the space occupied by _vtable_size;
}
int vtable_size() { return int(uintx(_vtable_size)); } int vtable_size() { return int(uintx(_vtable_size)); }
void set_vtable_size(int n) { _vtable_size = intptr_t(n); } void set_vtable_size(int n) { _vtable_size = intptr_t(n); }
intptr_t* cloned_vtable() { return &_cloned_vtable[0]; } // Using _cloned_vtable[i] for i > 0 causes undefined behavior. We use address calculation instead.
void zero() { memset(_cloned_vtable, 0, sizeof(intptr_t) * vtable_size()); } intptr_t* cloned_vtable() { return (intptr_t*)((char*)this + cloned_vtable_offset()); }
void zero() { memset(cloned_vtable(), 0, sizeof(intptr_t) * vtable_size()); }
// Returns the address of the next CppVtableInfo that can be placed immediately after this CppVtableInfo // Returns the address of the next CppVtableInfo that can be placed immediately after this CppVtableInfo
static size_t byte_size(int vtable_size) { static size_t byte_size(int vtable_size) {
CppVtableInfo i; return cloned_vtable_offset() + (sizeof(intptr_t) * vtable_size);
return pointer_delta(&i._cloned_vtable[vtable_size], &i, sizeof(u1));
} }
}; };