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ceph: avoid possible null deref in readdir after dir llseek
last may be NULL, but we dereference it in the else branch without checking. Normally it doesn't trigger because last == NULL when fpos == 2, but it could happen on a newly opened dir if the user seeks forward. Reported-by: Dan Carpenter <error27@gmail.com> Signed-off-by: Sage Weil <sage@newdream.net>
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