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For a pointer array reference that is annotated with counted_by attribute,
such as:
struct annotated {
int *c __attribute__ ((counted_by (b)));
int b;
};
struct annotated *p = setup (10);
p->c[12] = 2; //out of bound access
the IR for p->c[12] is:
(.ACCESS_WITH_SIZE (p->c, &p->b, 0B, 4) + 48) = 2;
The current routine get_index_from_offset in c-family/c-ubsan.cc cannot
handle the integer constant offset "48" correctly.
The fix is to enhance "get_index_from_offset" to correctly handle the constant
offset.
PR c/124230
gcc/c-family/ChangeLog:
* c-ubsan.cc (get_index_from_offset): Handle the special case when
the offset is an integer constant.
gcc/testsuite/ChangeLog:
* gcc.dg/ubsan/pointer-counted-by-bounds-124230-char.c: New test.
* gcc.dg/ubsan/pointer-counted-by-bounds-124230-float.c: New test.
* gcc.dg/ubsan/pointer-counted-by-bounds-124230-struct.c: New test.
* gcc.dg/ubsan/pointer-counted-by-bounds-124230-union.c: New test.
* gcc.dg/ubsan/pointer-counted-by-bounds-124230.c: New test.
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