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gdbusmessage: Gracefully handle message signatures with invalid types

Philip Withnall requested to merge pwithnall/glib:ossfuzz-11120-dbus-message-types into master

With the changes to limit GVariant type nesting (commit 7c4e6e9f), it’s now possible to have a valid type signature which is not a valid GVariant type when enclosed in parentheses (to make it a tuple).

Check for that when parsing the signature field in a D-Bus message.

oss-fuzz#11120

Signed-off-by: Philip Withnall withnall@endlessm.com

Edited by Philip Withnall

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