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[PowerRename] Do not crash with big counter values and bound max padd… (#28249)

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This commit is contained in:
Andrey Nekrasov
2023-09-07 16:33:07 +02:00
committed by GitHub
parent 2ecf5f41c2
commit 380895a2ca
1 changed files with 10 additions and 1 deletions
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11
src/modules/powerrename/lib/Enumerating.h
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@@ -32,7 +32,7 @@ std::vector<EnumOptions> parseEnumOptions(const std::wstring& replaceWith);
struct Enumerator
{
inline Enumerator(EnumOptions options) :
start{ options.start.value_or(0) }, increment{ options.increment.value_or(1) }, padding{ options.padding.value_or(0) }, replaceStrSpan{ options.replaceStrSpan }
start{ options.start.value_or(0) }, increment{ options.increment.value_or(1) }, padding{ options.padding.value_or(0) % MAX_PATH }, replaceStrSpan{ options.replaceStrSpan }
{
}
@@ -43,6 +43,15 @@ struct Enumerator
const int32_t enumeratedIndex = enumerate(index);
wchar_t format[32];
swprintf_s(format, sizeof(format) / sizeof(wchar_t), L"%%0%ud", padding);
//swprintf panics when the buffer is too small, so we're checking the required buffer size ahead of printing to it and falling back to 0 padding in case it cannot fit. Note that we must use swprintf with nullptr buf, because the _s version panics on it as well.
const size_t requiredBufSize = swprintf(nullptr, 0, format, enumeratedIndex) + 1ull;
const bool fitsBuf = requiredBufSize < bufSize;
if (!fitsBuf)
{
swprintf_s(format, sizeof(format) / sizeof(wchar_t), L"%%%ud", 0);
}
return swprintf_s(buf, bufSize, format, enumeratedIndex);
}