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dip1000: can escape stack pointer through indexed array literal #20901

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dkorpel opened this issue Feb 19, 2025 · 0 comments

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dip1000

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dkorpel commented Feb 19, 2025

The compiler accepts this:

// REQUIRED_ARGS: -preview=dip1000
int* f() @safe
{
    int i = 3;
    auto x = &[&i][0]; // Should error, i is escaped into allocated memory
    return *x;
}

Demonstration of memory corruption:

void main()
{
    ubyte[64] buf;
    auto p = f();
    writeln(*p); // 3
    buf[] = 7;
    writeln(*p); // -326519080
}

dkorpel added the dip1000 label

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