Description: vhost_net: fix possible infinite loop
References:
 https://lore.kernel.org/lkml/1558067392-11740-1-git-send-email-jasowang@redhat.com/
Notes:
Bugs:
upstream: released (5.2-rc4) [e2412c07f8f3040593dfb88207865a3cd58680c0, e79b431fb901ba1106670bcc80b9b617b25def7d, c1ea02f15ab5efb3e93fc3144d895410bf79fcf2]
4.19-upstream-stable: released (4.19.64) [3af3b843aee41ed22343b011a4cf3812a80d2f38, 239910101c4ebf91a00e6f4a81ac3144b121f0c4, 02cdc166128cf9cb2be4786b997eebbc0b976bfa]
4.9-upstream-stable: released (4.9.190) [66c8d9d53e657d5068d9f234bc4ec1d703107a48, 4b586288578a3a2aa4efb969feed86f2d760f082, 02b40edda9fd2e42abae40f5dd85122f13dbe7b8]
3.16-upstream-stable: released (3.16.72) [f3a64b1071c414e59233b769110872a026f8d254, 6c74f68cf3ca570f39ff8a9e3b0ae357839c4560]
sid: released (5.2.6-1)
4.19-buster-security: released (4.19.67-1)
4.9-stretch-security: released (4.9.168-1+deb9u5) [bugfix/all/vhost-introduce-vhost_exceeds_weight.patch, bugfix/all/vhost_net-fix-possible-infinite-loop.patch, bugfix/all/vhost-scsi-add-weight-support.patch]
3.16-jessie-security: released (3.16.72-1)