Mateusz Guzik
fee204544e
fd: fix f_count acquire in fget_unlocked ...
The code was using a hand-rolled fcmpset loop, while in other places the same
count is manipulated with the refcount API.
This transferred from a stylistic issue into a bug after the API got extended
to support flags. As a result the hand-rolled loop could bump the count high
enough to set the bit flag. Another bump + refcount_release would then free
the file prematurely.
The bug is only present in -CURRENT.
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fee204544e