linux-kernel - Re: [sctp] 327fecdaf3: BUG:kernel_NULL_pointer

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Date:   Mon, 4 Nov 2019 10:25:08 -0300
From:   Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
To:     kernel test robot <rong.a.chen@...el.com>
Cc:     Wally Zhao <wallyzhao@...il.com>, vyasevich@...il.com,
        nhorman@...driver.com, davem@...emloft.net,
        linux-sctp@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, wally.zhao@...ia-sbell.com,
        lkp@...ts.01.org
Subject: Re: [sctp] 327fecdaf3: BUG:kernel_NULL_pointer_dereference,address

On Mon, Nov 04, 2019 at 04:46:35PM +0800, kernel test robot wrote:
> [   35.312661] BUG: kernel NULL pointer dereference, address: 00000000000005d8
> [   35.316225] #PF: supervisor read access in kernel mode
> [   35.319178] #PF: error_code(0x0000) - not-present page
> [   35.322078] PGD 800000021b569067 P4D 800000021b569067 PUD 21b688067 PMD 0 
> [   35.325629] Oops: 0000 [#1] SMP PTI
> [   35.327965] CPU: 0 PID: 3148 Comm: trinity-c5 Not tainted 5.4.0-rc3-01107-g327fecdaf39ab #12
> [   35.332863] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
> [   35.337932] RIP: 0010:sctp_packet_transmit+0x767/0x822

Right, as asoc can be NULL by then. (per the check on it a few lines
before the change here).

  Marcelo