Description: Double-free in usbtv driver
References:
 http://linuxtesting.org/pipermail/ldv-project/2017-November/001008.html
 https://git.linuxtv.org/media_tree.git/commit?id=50e7044535537b2a54c7ab798cd34c7f6d900bd2
Notes:
 bwh> Introduced in 3.18 by commit 63ddf68de52e "[media] usbtv: add audio
 bwh> support".
Bugs:
upstream: released (4.17-rc1) [50e7044535537b2a54c7ab798cd34c7f6d900bd2]
4.9-upstream-stable: released (4.9.93) [50cd7759a34104c3acb510e644355d4ae8010851]
3.16-upstream-stable: N/A "Vulnerable code path not present"
3.2-upstream-stable: N/A "Vulnerable code path not present"
sid: released (4.15.17-1)
4.9-stretch-security: released (4.9.88-1) [bugfix/all/media-usbtv-prevent-double-free-in-error-case.patch]
3.16-jessie-security: N/A "Vulnerable code path not present"
3.2-wheezy-security: N/A "Vulnerable code path not present"