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Message-ID: <ZS4z1mxtTIEpFZI/@xsang-OptiPlex-9020> Date: Tue, 17 Oct 2023 15:12:22 +0800 From: Oliver Sang <oliver.sang@...el.com> To: Anjali Kulkarni <anjali.k.kulkarni@...cle.com> CC: Jakub Kicinski <kuba@...nel.org>, "oe-lkp@...ts.linux.dev" <oe-lkp@...ts.linux.dev>, "lkp@...el.com" <lkp@...el.com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "David S. Miller" <davem@...emloft.net>, Liam Howlett <liam.howlett@...cle.com>, "netdev@...r.kernel.org" <netdev@...r.kernel.org>, <oliver.sang@...el.com> Subject: Re: [linus:master] [connector/cn_proc] 2aa1f7a1f4: BUG:kernel_NULL_pointer_dereference,address hi, Anjali Kulkarni, On Fri, Oct 13, 2023 at 11:00:31PM +0000, Anjali Kulkarni wrote: > > > > On Oct 4, 2023, at 8:40 AM, Jakub Kicinski <kuba@...nel.org> wrote: > > > > On Wed, 20 Sep 2023 14:51:32 +0800 kernel test robot wrote: > >> kernel test robot noticed "BUG:kernel_NULL_pointer_dereference,address" on: > >> > >> commit: 2aa1f7a1f47ce8dac7593af605aaa859b3cf3bb1 ("connector/cn_proc: Add filtering to fix some bugs") > >> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master > > > > Anjali, have you had the chance to look into this? > > Hi, > I was unable to reproduce the issues with the steps given - many packages are missing, etc. - I am still trying though - however, the stack trace of this issue shows it is a NULL pointer de-reference (it looks like in cn_filter() function) - and I found a potential suspect where a check for NULL pointer was missing. So I’ve sent out the patch fix for this - is it possible for someone to please test with this fix and let me know if the issue is resolved? The fix looks like: I applied below patch upon v6.6-rc6, the issue reported by original report was gone. (and I confirmed the issue still can be reproduced on v6.6-rc6) Tested-by: kernel test robot <oliver.sang@...el.com> > > diff --git a/drivers/connector/cn_proc.c b/drivers/connector/cn_proc.c > index 05d562e9c8b1..a8e55569e4f5 100644 > --- a/drivers/connector/cn_proc.c > +++ b/drivers/connector/cn_proc.c > @@ -54,7 +54,7 @@ static int cn_filter(struct sock *dsk, struct sk_buff *skb, void *data) > enum proc_cn_mcast_op mc_op; > uintptr_t val; > > - if (!dsk || !data) > + if (!dsk || !data || !dsk->sk_user_data) > return 0; > > ptr = (__u32 *)data; > -- 2.42.0 > >
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