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| author | Trond Myklebust <trond.myklebust@hammerspace.com> | 2020-04-30 22:08:26 +0300 |
|---|---|---|
| committer | Trond Myklebust <trond.myklebust@hammerspace.com> | 2020-04-30 22:08:26 +0300 |
| commit | 9c07b75b80eeff714420fb6a4c880b284e529d0f (patch) | |
| tree | 0249c9037cd08d13e2d1c354c27ffad8636f08cb /fs/nfs/super.c | |
| parent | 8e2912c7c69e3f5cbf830d529a42b9940e98950b (diff) | |
| download | linux-9c07b75b80eeff714420fb6a4c880b284e529d0f.tar.xz | |
NFS: Fix a race in __nfs_list_for_each_server()
The struct nfs_server gets put on the cl_superblocks list before
the server->super field has been initialised, in which case the
call to nfs_sb_active() will Oops. Add a check to ensure that
we skip such a list entry.
Fixes: 3c9e502b59fb ("NFS: Add a helper nfs_client_for_each_server()")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Diffstat (limited to 'fs/nfs/super.c')
| -rw-r--r-- | fs/nfs/super.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/nfs/super.c b/fs/nfs/super.c index 59ef3b13ccca..bdb6d0c2e755 100644 --- a/fs/nfs/super.c +++ b/fs/nfs/super.c @@ -185,7 +185,7 @@ static int __nfs_list_for_each_server(struct list_head *head, rcu_read_lock(); list_for_each_entry_rcu(server, head, client_link) { - if (!nfs_sb_active(server->super)) + if (!(server->super && nfs_sb_active(server->super))) continue; rcu_read_unlock(); if (last) |