Description: f2fs: fix a bug caused by NULL extent tree References: Notes: bwh> The extent tree was implemented in f2fs in 4.3, so I think the bwh> vulnerability cannot be older than that. Bugs: upstream: released (4.13-rc1) [dad48e73127ba10279ea33e6dbc8d3905c4d31c0] 4.9-upstream-stable: released (4.9.86) [4a97b2d09d332c43612f489c99b97d691002b6d4] 3.16-upstream-stable: N/A "Vulnerable code not present" 3.2-upstream-stable: N/A "Vulnerable code not present" sid: released (4.13.4-1) 4.9-stretch-security: released (4.9.88-1) 3.16-jessie-security: N/A "Vulnerable code not present" 3.2-wheezy-security: N/A "Vulnerable code not present"