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kernel/svc: Do nothing if svcOutputDebugString's length is <= 0

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While likely very uncommon, this sanitizes the input and does nothing in
the event of the length being equal to or less than zero, avoiding
constructing a std::string when there's no need to. It also avoids an
out-of-memory scenario, as a negative value would wrap around to its
equivalent unsigned representation in std::string's constructor.

e.g. If someone was silly and a length of -1 was specified, this would
make a string with a length of 0xFFFFFFFFFFFFFFFF on a 64-bit platform,
which will obviously eventually fail due to the allocation being way too
large.
This commit is contained in:
Lioncash 2018-09-17 19:49:54 -04:00
parent dc863724ac
commit 5ddd382a9b
1 changed files with 4 additions and 0 deletions
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src/core/hle/kernel/svc.cpp
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@ -662,6 +662,10 @@ static void Break(u8 break_reason) {
/// Used to output a message on a debug hardware unit - does nothing on a retail unit /// Used to output a message on a debug hardware unit - does nothing on a retail unit
static void OutputDebugString(VAddr address, int len) { static void OutputDebugString(VAddr address, int len) {
if (len <= 0) {
return;
}
std::string string(len, ' '); std::string string(len, ' ');
Memory::ReadBlock(address, string.data(), len); Memory::ReadBlock(address, string.data(), len);
LOG_DEBUG(Debug_Emulated, "{}", string); LOG_DEBUG(Debug_Emulated, "{}", string);