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Date: Thu, 6 Aug 2020 13:08:58 +0100 From: Al Viro <viro@...iv.linux.org.uk> To: linmiaohe <linmiaohe@...wei.com> Cc: davem@...emloft.net, kuba@...nel.org, netdev@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH 3/5] net: Set fput_needed iff FDPUT_FPUT is set On Thu, Aug 06, 2020 at 12:59:16PM +0100, Al Viro wrote: > On Thu, Aug 06, 2020 at 07:53:16PM +0800, linmiaohe wrote: > > From: Miaohe Lin <linmiaohe@...wei.com> > > > > We should fput() file iff FDPUT_FPUT is set. So we should set fput_needed > > accordingly. > > > > Fixes: 00e188ef6a7e ("sockfd_lookup_light(): switch to fdget^W^Waway from fget_light") > > Explain, please. We are getting it from fdget(); what else can we get in flags there? FWIW, struct fd ->flags may have two bits set: FDPUT_FPUT and FDPUT_POS_UNLOCK. The latter is set only by __fdget_pos() and its callers, and that only for regular files and directories. Nevermind that sockfd_lookup_light() does *not* use ..._pos() family of primitives, even if it started to use e.g. fdget_pos() it *still* would not end up with anything other than FDPUT_FPUT to deal with on that path - it checks that what it got is a socket. Anything else is dropped right there, without leaving fput() to caller. So could you explain what exactly the bug is - if you are seeing some breakage and this patch fixes it, something odd is definitely going on and it would be nice to figure out what that something is.
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