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vhost: fix possible denial of service by leaking FDs
A malicious Vhost-user master could send in loop hand-crafted vhost-user messages containing more file descriptors the vhost-user slave expects. Doing so causes the application using the vhost-user library to run out of FDs. This issue has been assigned CVE-2019-14818 Fixes: 8f97231 ("vhost: support vhost-user") Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
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