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Merge #9693: Prevent integer overflow in ReadVarInt.

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45f0961 Prevent integer overflow in ReadVarInt. (Gregory Maxwell)

Tree-SHA512: 385ea0efb6b59d44c45a49227e5f6fff236b4775544cbeb236312a3fd87fd75c226ac56f7aa1bca66b853639da75a579610074f7582f92cf2ebd4a74bc40f6f0
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Pieter Wuille 2017-04-17 04:46:34 -07:00
commit c5e9e428a9
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1 changed files with 9 additions and 2 deletions
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11
src/serialize.h
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@ -336,11 +336,18 @@ I ReadVarInt(Stream& is)
I n = 0; I n = 0;
while(true) { while(true) {
unsigned char chData = ser_readdata8(is); unsigned char chData = ser_readdata8(is);
if (n > (std::numeric_limits<I>::max() >> 7)) {
throw std::ios_base::failure("ReadVarInt(): size too large");
}
n = (n << 7) | (chData & 0x7F); n = (n << 7) | (chData & 0x7F);
if (chData & 0x80) if (chData & 0x80) {
if (n == std::numeric_limits<I>::max()) {
throw std::ios_base::failure("ReadVarInt(): size too large");
}
n++; n++;
else } else {
return n; return n;
}
} }
} }