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Commitdcb942d

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fix: prevent DoS (OOM) via massive packets (#95)
When maxHttpBufferSize is large (1e8 bytes), a payload of length 100MBcan be sent like so:99999991:422222222222222222222222222222222222222222222...This massive packet can cause OOM via building up many many`ConsOneByteString` objects due to concatenation:99999989 `ConsOneByteString`s and then converting the massive integer toa `Number`.The performance can be improved to avoid this by using `substring`rather than building the string via concatenation.Below I tried one payload of length 7e7 as the 1e8 payload took solong to process that it timed out before running out of memory.```==== JS stack trace ========================================= 0: ExitFrame [pc: 0x13c5b79]Security context: 0x152fe7b808d1 <JSObject> 1: decodeString [0x2dd385fb5d1] [/node_modules/socket.io-parser/index.js:~276] [pc=0xf59746881be](this=0x175d34c42b69 <JSGlobal Object>,0x14eccff10fe1 <Very long string[69999990]>) 2: add [0x31fc2693da29] [/node_modules/socket.io-parser/index.js:242] [bytecode=0xa7ed6554889 offset=11](this=0x0a2881be5069 <Decoder map = 0x3ceaa8bf48c9>,0x14eccff10fe1 <Very...FATAL ERROR: Ineffective mark-compacts near heap limit Allocation failed - JavaScript heap out of memory 1: 0xa09830 node::Abort() [node] 2: 0xa09c55 node::OnFatalError(char const*, char const*) [node] 3: 0xb7d71e v8::Utils::ReportOOMFailure(v8::internal::Isolate*, char const*, bool) [node] 4: 0xb7da99 v8::internal::V8::FatalProcessOutOfMemory(v8::internal::Isolate*, char const*, bool) [node] 5: 0xd2a1f5 [node] 6: 0xd2a886 v8::internal::Heap::RecomputeLimits(v8::internal::GarbageCollector) [node] 7: 0xd37105 v8::internal::Heap::PerformGarbageCollection(v8::internal::GarbageCollector, v8::GCCallbackFlags) [node] 8: 0xd37fb5 v8::internal::Heap::CollectGarbage(v8::internal::AllocationSpace, v8::internal::GarbageCollectionReason, v8::GCCallbackFlags) [node] 9: 0xd3965f v8::internal::Heap::HandleGCRequest() [node]10: 0xce8395 v8::internal::StackGuard::HandleInterrupts() [node]11: 0x1042cb6 v8::internal::Runtime_StackGuard(int, unsigned long*, v8::internal::Isolate*) [node]12: 0x13c5b79 [node]```
1 parenta5d0435 commitdcb942d

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‎index.js‎

Lines changed: 7 additions & 10 deletions
Original file line numberDiff line numberDiff line change
@@ -286,11 +286,9 @@ function decodeString(str) {
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// look up attachments if type binary
288288
if(exports.BINARY_EVENT===p.type||exports.BINARY_ACK===p.type){
289-
varbuf='';
290-
while(str.charAt(++i)!=='-'){
291-
buf+=str.charAt(i);
292-
if(i==str.length)break;
293-
}
289+
varstart=i+1;
290+
while(str.charAt(++i)!=='-'&&i!=str.length){}
291+
varbuf=str.substring(start,i);
294292
if(buf!=Number(buf)||str.charAt(i)!=='-'){
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thrownewError('Illegal attachments');
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}
@@ -299,31 +297,30 @@ function decodeString(str) {
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300298
// look up namespace (if any)
301299
if('/'===str.charAt(i+1)){
302-
p.nsp='';
300+
varstart=i+1;
303301
while(++i){
304302
varc=str.charAt(i);
305303
if(','===c)break;
306-
p.nsp+=c;
307304
if(i===str.length)break;
308305
}
306+
p.nsp=str.substring(start,i);
309307
}else{
310308
p.nsp='/';
311309
}
312310

313311
// look up id
314312
varnext=str.charAt(i+1);
315313
if(''!==next&&Number(next)==next){
316-
p.id='';
314+
varstart=i+1;
317315
while(++i){
318316
varc=str.charAt(i);
319317
if(null==c||Number(c)!=c){
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--i;
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break;
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}
323-
p.id+=str.charAt(i);
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if(i===str.length)break;
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}
326-
p.id=Number(p.id);
323+
p.id=Number(str.substring(start,i+1));
327324
}
328325

329326
// look up json data

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