ext4 crypto: use dget_parent() in ext4_d_revalidate()
This avoids potential problems caused by a race where the inode gets renamed out from its parent directory and the parent directory is deleted while ext4_d_revalidate() is running. Fixes: 28b4c263Reported-by: NAl Viro <viro@ZenIV.linux.org.uk> Signed-off-by: NTheodore Ts'o <tytso@mit.edu> Cc: stable@vger.kernel.org
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