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authorJ. Bruce Fields <bfields@citi.umich.edu>2009-05-05 19:04:29 -0400
committerJ. Bruce Fields <bfields@citi.umich.edu>2009-05-06 16:16:36 -0400
commitb2c0cea6b1cb210e962f07047df602875564069e (patch)
treef6327b45df075955d8ef9e9ad93c453ea5fc7a4c /fs/lockd
parentccecee1e5e42981f5eb37f4411e8552b9db04d30 (diff)
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nfsd4: check for negative dentry before use in nfsv4 readdir
After 2f9092e1020246168b1309b35e085ecd7ff9ff72 "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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