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2021-03-18T17:00:57.966735Z
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V 601
netmap: fix memory leak in NETMAP_REQ_PORT_INFO_GET

The netmap_ioctl() function has a reference counting bug in case of
NETMAP_REQ_PORT_INFO_GET command. When `hdr->nr_name[0] == '\0'`,
the function does not decrease the refcount of "nmd", which is
increased by netmap_mem_find(), causing a refcount leak.

Reported by:	Xiyu Yang <sherllyyang00@gmail.com>
Submitted by:	Carl Smith <carl.smith@alliedtelesis.co.nz>
MFC after: 3 days
PR:	254311

(cherry picked from commit 0ab5902e8ad93d0a9341dcce386b6c571ee02173)

Git Hash:   09b2bde74654a16c56ade52411c464ef79de8cd4
Git Author: vmaffione@FreeBSD.org
END