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AK: Assert that we don't create StringViews of negative length

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Due to us using size_t for the length, the actual value will always be positive.
If, for example, we calculate the length as "0 - 1", we'll get SIZE_T_MAX. What
we can do is check that adding the characters pointer and the length together
doesn't overflow.
This commit is contained in:
Sergey Bugaev 2020-04-30 00:17:54 +03:00 committed by Andreas Kling
parent 361a1b54d7
commit 135d29b498
Notes: sideshowbarker 2024-07-19 07:09:43 +09:00 
Author: https://github.com/bugaevc
Commit: https://github.com/SerenityOS/serenity/commit/135d29b498e
Pull-request: https://github.com/SerenityOS/serenity/pull/2024
Reviewed-by: https://github.com/awesomekling
1 changed files with 5 additions and 1 deletions
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6
AK/StringView.h
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@ -26,6 +26,8 @@
#pragma once
#include <AK/Assertions.h>
#include <AK/Checked.h>
#include <AK/Forward.h>
#include <AK/StdLibExtras.h>
#include <AK/StringUtils.h>
@ -36,16 +38,18 @@ class StringView {
public:
using ConstIterator = const char*;
StringView() {}
StringView() { }
StringView(const char* characters, size_t length)
: m_characters(characters)
, m_length(length)
{
ASSERT(!Checked<uintptr_t>::addition_would_overflow((uintptr_t)characters, length));
}
StringView(const unsigned char* characters, size_t length)
: m_characters((const char*)characters)
, m_length(length)
{
ASSERT(!Checked<uintptr_t>::addition_would_overflow((uintptr_t)characters, length));
}
[[gnu::always_inline]] inline StringView(const char* cstring)
: m_characters(cstring)