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Message-ID: <20231017080210.GG1751252@kernel.org> Date: Tue, 17 Oct 2023 10:02:10 +0200 From: Simon Horman <horms@...nel.org> To: Anjali Kulkarni <anjali.k.kulkarni@...cle.com> Cc: linux-kernel@...r.kernel.org, davem@...emloft.net, Liam.Howlett@...cle.com, netdev@...r.kernel.org, oliver.sang@...el.com, kuba@...nel.org Subject: Re: [PATCH v1] Fix NULL pointer dereference in cn_filter() On Fri, Oct 13, 2023 at 03:56:19PM -0700, Anjali Kulkarni wrote: > Check that sk_user_data is not NULL, else return from cn_filter(). Thanks, I agree that this change seems likely to address the problem at the link below. And I also think cn_filter() is a good place to fix this [1]. But I am wondering if you could add some commentary to the patch description, describing under what circumstances this problem can occur. [1] https://lore.kernel.org/all/20231013120105.GH29570@kernel.org/ > Fixes: 2aa1f7a1f47c ("connector/cn_proc: Add filtering to fix some bugs") > Reported-by: kernel test robot <oliver.sang@...el.com> > Closes: https://lore.kernel.org/oe-lkp/202309201456.84c19e27-oliver.sang@intel.com/ > Signed-off-by: Anjali Kulkarni <anjali.k.kulkarni@...cle.com> > --- > drivers/connector/cn_proc.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > 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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