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Fix numeric overflow checks in size classes

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This commit is contained in:
Slobodan Predolac
2026-05-26 12:37:32 -07:00
parent 136d342aa0
commit 6b24522545
3 changed files with 39 additions and 8 deletions
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11
test/unit/size_classes.c
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@@ -190,6 +190,9 @@ TEST_BEGIN(test_overflow) {
max_size_class = get_max_size_class();
max_psz = max_size_class + PAGE;
expect_zu_eq(max_size_class, SC_LARGE_MAXCLASS,
"Computed max size class should match SC_LARGE_MAXCLASS");
expect_u_eq(sz_size2index(max_size_class + 1), SC_NSIZES,
"sz_size2index() should return NSIZES on overflow");
expect_u_eq(sz_size2index(ZU(PTRDIFF_MAX) + 1), SC_NSIZES,
@@ -203,6 +206,14 @@ TEST_BEGIN(test_overflow) {
"sz_s2u() should return 0 for unsupported size");
expect_zu_eq(
sz_s2u(SIZE_T_MAX), 0, "sz_s2u() should return 0 on overflow");
expect_zu_eq(sz_s2u_compute_using_delta(SC_LARGE_MAXCLASS + 1), 0,
"sz_s2u_compute_using_delta() should return 0 for unsupported size");
expect_zu_eq(sz_s2u_compute_using_delta(SIZE_T_MAX), 0,
"sz_s2u_compute_using_delta() should return 0 on overflow");
expect_zu_eq(sz_sa2u(1, 0), 0,
"sz_sa2u() should return 0 for zero alignment");
expect_zu_eq(sz_sa2u(SIZE_T_MAX, PAGE), 0,
"sz_sa2u() should return 0 on overflow");
expect_u_eq(sz_psz2ind(max_size_class + 1), SC_NPSIZES,
"sz_psz2ind() should return NPSIZES on overflow");