6.18-stable review patch. If anyone has any objections, please let me know.
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From: Trond Myklebust trond.myklebust@hammerspace.com
[ Upstream commit 9bd545539b233725a3416801f7c374bff0327d6e ]
Ensure that the verifiers are initialised before calling d_splice_alias() in both nfs_prime_dcache() and nfs_lookup().
Reported-by: Michael Stoler michael.stoler@vastdata.com Fixes: a1147b8281bd ("NFS: Fix up directory verifier races") Signed-off-by: Trond Myklebust trond.myklebust@hammerspace.com Signed-off-by: Sasha Levin sashal@kernel.org --- fs/nfs/dir.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c index d557b0443e8b0..2eead7e85be5b 100644 --- a/fs/nfs/dir.c +++ b/fs/nfs/dir.c @@ -789,16 +789,17 @@ void nfs_prime_dcache(struct dentry *parent, struct nfs_entry *entry, goto out; }
+ nfs_set_verifier(dentry, dir_verifier); inode = nfs_fhget(dentry->d_sb, entry->fh, entry->fattr); alias = d_splice_alias(inode, dentry); d_lookup_done(dentry); if (alias) { if (IS_ERR(alias)) goto out; + nfs_set_verifier(alias, dir_verifier); dput(dentry); dentry = alias; } - nfs_set_verifier(dentry, dir_verifier); trace_nfs_readdir_lookup(d_inode(parent), dentry, 0); out: dput(dentry); @@ -1994,13 +1995,14 @@ struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, unsigned in nfs_lookup_advise_force_readdirplus(dir, flags);
no_entry: + nfs_set_verifier(dentry, dir_verifier); res = d_splice_alias(inode, dentry); if (res != NULL) { if (IS_ERR(res)) goto out; + nfs_set_verifier(res, dir_verifier); dentry = res; } - nfs_set_verifier(dentry, dir_verifier); out: trace_nfs_lookup_exit(dir, dentry, flags, PTR_ERR_OR_ZERO(res)); nfs_free_fattr(fattr);