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authorTrond Myklebust <trond.myklebust@hammerspace.com>2020-04-30 15:08:26 -0400
committerTrond Myklebust <trond.myklebust@hammerspace.com>2020-04-30 15:08:26 -0400
commit9c07b75b80eeff714420fb6a4c880b284e529d0f (patch)
tree0249c9037cd08d13e2d1c354c27ffad8636f08cb /fs/nfs/super.c
parentMerge tag 'nfs-rdma-for-5.7-2' of git://git.linux-nfs.org/projects/anna/linux-nfs (diff)
downloadlinux-dev-9c07b75b80eeff714420fb6a4c880b284e529d0f.tar.xz
linux-dev-9c07b75b80eeff714420fb6a4c880b284e529d0f.zip
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.c2
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)