18 lines
981 B
Diff
18 lines
981 B
Diff
Author: Guido Vranken <guidovranken@gmail.com>
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Description: pointer overflow in zmq::v2_decoder_t::size_ready
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leading to remote code execution (issue #3351).
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Refactor bounds check arithmetic such that no overflow shall occur
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Origin: https://github.com/zeromq/libzmq/pull/3353
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Applied-Upstream: 1a2ed12716693073032d57dac4e269df3d373751
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--- a/src/v2_decoder.cpp
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+++ b/src/v2_decoder.cpp
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@@ -108,7 +108,7 @@ int zmq::v2_decoder_t::size_ready(uint64_t msg_size, unsigned char const* read_p
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// the current message can exceed the current buffer. We have to copy the buffer
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// data into a new message and complete it in the next receive.
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- if (unlikely ((unsigned char*)read_pos + msg_size > (data() + size())))
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+ if (unlikely (msg_size > (size_t) (data () + size () - read_pos)))
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{
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// a new message has started, but the size would exceed the pre-allocated arena
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// this happens every time when a message does not fit completely into the buffer
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