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Date:   Sun, 21 Jul 2019 11:50:31 -0700 (PDT)
From:   David Miller <>
Subject: Re: [PATCH net-next] net: sched: verify that q!=NULL before
 setting q->flags

From: Vlad Buslov <>
Date: Sun, 21 Jul 2019 17:44:12 +0300

> In function int tc_new_tfilter() q pointer can be NULL when adding filter
> on a shared block. With recent change that resets TCQ_F_CAN_BYPASS after
> filter creation, following NULL pointer dereference happens in case parent
> block is shared:
> Verify that q pointer is not NULL before setting the 'flags' field.
> Fixes: 3f05e6886a59 ("net_sched: unset TCQ_F_CAN_BYPASS when adding filters")
> Signed-off-by: Vlad Buslov <>


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