Description: aio: take an extra file reference before call vfs_poll() References: https://patchwork.kernel.org/patch/10828359/ Notes: carnil> Fixes bfe4037e722e ("aio: implement IOCB_CMD_POLL") which is in carnil> 4.19-rc1 onwards. Bugs: upstream: released (5.1-rc1) [84c4e1f89fefe70554da0ab33be72c9be7994379] 4.19-upstream-stable: released (4.19.38) [d6b2615f7d31d8e58b685d42dbafcc7dc1204bbd] 4.9-upstream-stable: N/A "Vulnerable code introduced later" 3.16-upstream-stable: N/A "Vulnerable code introduced later" sid: released (4.19.37-1) [bugfix/all/0009-aio-simplify-and-fix-fget-fput-for-io_submit.patch] 4.9-stretch-security: N/A "Vulnerable code introduced later" 3.16-jessie-security: N/A "Vulnerable code introduced later"