mirror of https://gitee.com/openkylin/linux.git
4a9be28c45
If the last NFSv3 unmount from a given host races with a mount from the
same host, we can destroy an nlm_host that is still in use.
Specifically nlmclnt_lookup_host() can increment h_count on
an nlm_host that nlmclnt_release_host() has just successfully called
refcount_dec_and_test() on.
Once nlmclnt_lookup_host() drops the mutex, nlm_destroy_host_lock()
will be called to destroy the nlmclnt which is now in use again.
The cause of the problem is that the dec_and_test happens outside the
locked region. This is easily fixed by using
refcount_dec_and_mutex_lock().
Fixes:
|
||
|---|---|---|
| .. | ||
| Makefile | ||
| clnt4xdr.c | ||
| clntlock.c | ||
| clntproc.c | ||
| clntxdr.c | ||
| host.c | ||
| mon.c | ||
| netns.h | ||
| procfs.c | ||
| procfs.h | ||
| svc.c | ||
| svc4proc.c | ||
| svclock.c | ||
| svcproc.c | ||
| svcshare.c | ||
| svcsubs.c | ||
| xdr.c | ||
| xdr4.c | ||