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J. Bruce Fields authored
After 2f9092e1 "Fix i_mutex vs. readdir handling in nfsd" (and 14f7dd63 "Copy XFS readdir hack into nfsd code"), an entry may be removed between the first mutex_unlock and the second mutex_lock. In this case, lookup_one_len() will return a negative dentry. Check for this case to avoid a NULL dereference. Signed-off-by:
J. Bruce Fields <bfields@citi.umich.edu> Reviewed-by:
J. R. Okajima <hooanon05@yahoo.co.jp> Cc: stable@kernel.org
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