tree 0e9780bbbd7ae2aa0913a5ebbff8822d5fa7edd4
parent ee24eac3ebb781c12a654985e33ecaa07f4d0f95
author Vasily Averin <vvs@virtuozzo.com> 1510298366 +0300
committer J. Bruce Fields <bfields@redhat.com> 1511819111 -0500

race of lockd inetaddr notifiers vs nlmsvc_rqst change

lockd_inet[6]addr_event use nlmsvc_rqst without taken nlmsvc_mutex,
nlmsvc_rqst can be changed during execution of notifiers and crash the host.

Patch enables access to nlmsvc_rqst only when it was correctly initialized
and delays its cleanup until notifiers are no longer in use.

Note that nlmsvc_rqst can be temporally set to ERR_PTR, so the "if
(nlmsvc_rqst)" check in notifiers is insufficient on its own.

Signed-off-by: Vasily Averin <vvs@virtuozzo.com>
Tested-by: Scott Mayhew <smayhew@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>