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ubsan: extend ptr before adding to avoid overflow

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David Rubin 2024-12-26 03:05:49 -08:00 • committed by David Rubin
parent 590c613182
commit 658fba982c
1 changed files with 1 additions and 3 deletions
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4
lib/ubsan.zig
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@ -1,5 +1,3 @@
//! Minimal UBSan Runtime
const std = @import("std");
const builtin = @import("builtin");
const assert = std.debug.assert;
@ -471,7 +469,7 @@ fn floatCastOverflow(
// See: https://github.com/llvm/llvm-project/blob/release/19.x/compiler-rt/lib/ubsan/ubsan_handlers.cpp#L463
// for more information on this check.
const ptr: [*]const u8 = @ptrCast(data_handle);
if (ptr[0] + ptr[1] < 2 or ptr[0] == 0xFF or ptr[1] == 0xFF) {
if (@as(u16, ptr[0]) + @as(u16, ptr[1]) < 2 or ptr[0] == 0xFF or ptr[1] == 0xFF) {
const data: *const FloatCastOverflowData = @ptrCast(data_handle);
const from_value: Value = .{ .handle = from_handle, .type_descriptor = data.from };
logMessage("{} is outside the range of representable values of type {s}", .{