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nfsd: fix oops on access from high-numbered ports
This bug was always here, but before my commit 6fa0283 ("recheck for secure ports in fh_verify"), it could only be triggered by failure of a kmalloc(). After that commit it could be triggered by a client making a request from a non-reserved port for access to an export marked "secure". (Exports are "secure" by default.) The result is a struct svc_export with a reference count one too low, resulting in likely oopses next time the export is accessed. The reference counting here is not straightforward; a later patch will clean up fh_verify(). Thanks to Lukas Hejtmanek for the bug report and followup. Signed-off-by: J. Bruce Fields <[email protected]> Cc: Lukas Hejtmanek <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
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