Description: dm ioctl: fix out of bounds array access when no devices References: https://www.openwall.com/lists/oss-security/2021/03/28/1 Notes: bwh> Appears to have been introduced before 4.9. Bugs: upstream: released (5.12-rc5) [4edbe1d7bcffcd6269f3b5eb63f710393ff2ec7a] 5.10-upstream-stable: released (5.10.27) [921aae17bb0f02181fa05cf5580ebc855fdbd74d] 4.19-upstream-stable: released (4.19.184) [76aa61c55279fdaa8d428236ba8834edf313b372] 4.9-upstream-stable: released (4.9.269) [c13f07341685149cfbc2014e8b4a85ff56d4ae0e] sid: released (5.10.28-1) 4.19-buster-security: released (4.19.194-1) 4.9-stretch-security: released (4.9.272-1)