balazske added a comment. About the first postgres result in pg_backup_tar.c: At step 3 we see that original value of `len` is 1. The condition in step 5 is true, then `th->filelen-th->pos` should be < 1. This is the new value assigned to `len`. In step 6 `len` can be only <=0. Still the condition is assumed to be false what is not possible. At this point the path becomes already invalid.
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