> On Jul 15, 2020, at 10:48 AM, Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx> wrote: > > Hi, > > Multiple users reported NFS causes NULL pointer dereference [1] on Ubuntu, due to commit "SUNRPC: Add "@len" parameter to gss_unwrap()" and commit "SUNRPC: Fix GSS privacy computation of auth->au_ralign". > > The same issue happens on upstream stable 5.4.y branch. > The mainline kernel doesn't have this issue though. > > Should we revert them? Or is there any missing commits need to be backported to v5.4? > > [1] https://bugs.launchpad.net/bugs/1886277 > > Kai-Heng 31c9590ae468 ("SUNRPC: Add "@len" parameter to gss_unwrap()") is a refactoring change. It shouldn't have introduced any behavior difference. But in theory, practice and theory should be the same... Check if 0a8e7b7d0846 ("SUNRPC: Revert 241b1f419f0e ("SUNRPC: Remove xdr_buf_trim()")") is also applied to 5.4.0-40-generic. It would help to know if v5.5 stable is working for you. I haven't had any problems with it. -- Chuck Lever
