Description: net-gro: fix use-after-free read in napi_gro_frags()
References:
 https://bugzilla.redhat.com/show_bug.cgi?id=1781204
Notes:
 carnil> No details by Red Hat provided apart only internal reference to
 carnil> http://patchwork.lab.bos.redhat.com/patch/271215/
Bugs:
upstream: released (5.2-rc3) [a4270d6795b0580287453ea55974d948393e66ef]
4.19-upstream-stable: released (4.19.48) [39fd0dc4a5565a1df7d84b1c92d2050233b15b5a]
4.9-upstream-stable: released (4.9.181) [12855df4065b6e13878d7b8abc948aa719295bc1]
3.16-upstream-stable: released (3.16.75) [f41184b4ba5bbf98b8eecae2a16fca34a669376f]
sid: released (5.2.6-1)
4.19-buster-security: released (4.19.67-1)
4.9-stretch-security: released (4.9.184-1)
3.16-jessie-security: released (3.16.76-1)