[stable] udf: avoid info leak on export (CVE-2012-6548)

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This fix is needed on stable branches 3.0.y, 3.2.y, 3.4.y and 3.5.7.z:

commit 0143fc5e9f6f5aad4764801015bc8d4b4a278200
Author: Mathias Krause <minipli@xxxxxxxxxxxxxx>
Date:   Thu Jul 12 08:46:55 2012 +0200

    udf: avoid info leak on export
    
    For type 0x51 the udf.parent_partref member in struct fid gets copied
    uninitialized to userland. Fix this by initializing it to 0.
    
    Signed-off-by: Mathias Krause <minipli@xxxxxxxxxxxxxx>
    Signed-off-by: Jan Kara <jack@xxxxxxx>

-- 
Ben Hutchings
It is easier to write an incorrect program than to understand a correct one.

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