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git2svn
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2021-03-18T17:08:12.342609Z
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V 531
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

Git Hash:   4019787f50a2826e9a4bba6e70868467b3d6081a
Git Author: vmaffione@FreeBSD.org
END