28615552309

Committed 02 Jul 2026 07:16PM UTC coverage: 75.443% (-0.02%) from 75.458%

Build # 28615552309

Build Type

push

github

Committed by

bluca

Commit Message

Fix signed char sign extension in UDP engine in_event()

On platforms where char is signed (Linux x86-64, MSVC, ARM with
-fsigned-char), _in_buffer[0] with a byte value >= 0x80 undergoes
sign extension when assigned to int group_size. For example, byte
0x80 becomes -128. This negative value is then implicitly cast to
size_t in msg.init_size(), producing a value near SIZE_MAX. The
allocation fails and errno_assert terminates the process.

The out_event() send path already correctly uses
static_cast<unsigned char> for the group size byte. Apply the same
cast on the receive path for consistency.

Signed-off-by: Tristan Music <tristmd@gmail.com>

Coverage Stats

15146 of 20076 relevant lines covered (75.44%)

27068.84 hits per line

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79.53

/libzmq/src/udp_engine.cpp

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zeromq / libzmq / 28615552309

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