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virtio-devices: vsock: handle short read in muxer

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Use read_exact to make sure we really get the minimum number of bytes.

Fixes: #6621
Signed-off-by: Wei Liu <liuwe@microsoft.com>
This commit is contained in:
Wei Liu 2024-07-31 06:36:00 +00:00 committed by Bo Chen
parent 2ffd5df018
commit 82ac114b8a
1 changed files with 4 additions and 5 deletions
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9
virtio-devices/src/vsock/unix/muxer.rs
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@ -495,11 +495,10 @@ impl VsockMuxer {
const MIN_COMMAND_LEN: usize = 10;
// Bring in the minimum number of bytes that we should be able to read.
if command.len < MIN_COMMAND_LEN {
command.len += stream
.read(&mut command.buf[command.len..MIN_COMMAND_LEN])
.map_err(Error::UnixRead)?;
}
stream
.read_exact(&mut command.buf[command.len..MIN_COMMAND_LEN])
.map_err(Error::UnixRead)?;
command.len = MIN_COMMAND_LEN;
// Now, finish reading the destination port number, by bringing in one byte at a time,
// until we reach an EOL terminator (or our buffer space runs out). Yeah, not