Sebastian Wilhelmi 4b9a27a868 gdbusmessage: Add more bounds checking when parsing D-Bus messages
Perform strict bounds checking when reading data from the D-Bus message,
and propagate errors to the callers.

Previously, truncated D-Bus messages could cause out-of-bounds reads.

This is a security issue, but one which is only exploitable when
communicating with an untrusted peer (who might send malicious
messages). Almost all D-Bus traffic is with a session or system bus,
where the dbus-daemon or dbus-broker is trusted, and is known to have
already rejected malformed (malicious) messages.

Accordingly, this is only exploitable with peer-to-peer D-Bus
conversations with an untrusted peer.

(Includes some minor cleanups from Philip Withnall.)

oss-fuzz#17408
Fixes: #2528
2021-11-23 12:32:31 +00:00
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