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Date: Mon, 24 Apr 2023 10:29:02 +0000
From: Subbaraya Sundeep Bhatta <sbhatta@...vell.com>
To: Leon Romanovsky <leon@...nel.org>,
Geethasowjanya Akula <gakula@...vell.com>
CC: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"kuba@...nel.org" <kuba@...nel.org>,
"davem@...emloft.net" <davem@...emloft.net>,
"edumazet@...gle.com" <edumazet@...gle.com>,
"pabeni@...hat.com" <pabeni@...hat.com>,
"richardcochran@...il.com" <richardcochran@...il.com>,
Sunil Kovvuri Goutham <sgoutham@...vell.com>,
Hariprasad Kelam <hkelam@...vell.com>
Subject: RE: [EXT] Re: [net PATCH 5/9] octeontx2-pf: mcs: Fix NULL pointer
dereferences
Hi,
>-----Original Message-----
>From: Leon Romanovsky <leon@...nel.org>
>Sent: Sunday, April 23, 2023 10:22 PM
>To: Geethasowjanya Akula <gakula@...vell.com>
>Cc: netdev@...r.kernel.org; linux-kernel@...r.kernel.org; kuba@...nel.org;
>davem@...emloft.net; edumazet@...gle.com; pabeni@...hat.com;
>richardcochran@...il.com; Sunil Kovvuri Goutham
><sgoutham@...vell.com>; Subbaraya Sundeep Bhatta
><sbhatta@...vell.com>; Hariprasad Kelam <hkelam@...vell.com>
>Subject: [EXT] Re: [net PATCH 5/9] octeontx2-pf: mcs: Fix NULL pointer
>dereferences
>
>On Sun, Apr 23, 2023 at 03:24:50PM +0530, Geetha sowjanya wrote:
>> From: Subbaraya Sundeep <sbhatta@...vell.com>
>>
>> When system is rebooted after creating macsec interface below NULL
>> pointer dereference crashes occurred. This patch fixes those crashes.
>>
>> [ 3324.406942] Unable to handle kernel NULL pointer dereference at
>> virtual address 0000000000000000 [ 3324.415726] Mem abort info:
>> [ 3324.418510] ESR = 0x96000006
>> [ 3324.421557] EC = 0x25: DABT (current EL), IL = 32 bits
>> [ 3324.426865] SET = 0, FnV = 0
>> [ 3324.429913] EA = 0, S1PTW = 0
>> [ 3324.433047] Data abort info:
>> [ 3324.435921] ISV = 0, ISS = 0x00000006
>> [ 3324.439748] CM = 0, WnR = 0
>> ....
>> [ 3324.575915] Call trace:
>> [ 3324.578353] cn10k_mdo_del_secy+0x24/0x180 [ 3324.582440]
>> macsec_common_dellink+0xec/0x120 [ 3324.586788]
>> macsec_notify+0x17c/0x1c0 [ 3324.590529]
>> raw_notifier_call_chain+0x50/0x70 [ 3324.594965]
>> call_netdevice_notifiers_info+0x34/0x7c
>> [ 3324.599921] rollback_registered_many+0x354/0x5bc
>> [ 3324.604616] unregister_netdevice_queue+0x88/0x10c
>> [ 3324.609399] unregister_netdev+0x20/0x30 [ 3324.613313]
>> otx2_remove+0x8c/0x310 [ 3324.616794] pci_device_shutdown+0x30/0x70
>[
>> 3324.620882] device_shutdown+0x11c/0x204
>>
>> [ 966.664930] Unable to handle kernel NULL pointer dereference at
>> virtual address 0000000000000000 [ 966.673712] Mem abort info:
>> [ 966.676497] ESR = 0x96000006
>> [ 966.679543] EC = 0x25: DABT (current EL), IL = 32 bits
>> [ 966.684848] SET = 0, FnV = 0
>> [ 966.687895] EA = 0, S1PTW = 0
>> [ 966.691028] Data abort info:
>> [ 966.693900] ISV = 0, ISS = 0x00000006
>> [ 966.697729] CM = 0, WnR = 0
>> ....
>> [ 966.833467] Call trace:
>> [ 966.835904] cn10k_mdo_stop+0x20/0xa0 [ 966.839557]
>> macsec_dev_stop+0xe8/0x11c [ 966.843384]
>__dev_close_many+0xbc/0x140
>> [ 966.847298] dev_close_many+0x84/0x120 [ 966.851039]
>> rollback_registered_many+0x114/0x5bc
>> [ 966.855735] unregister_netdevice_many.part.0+0x14/0xa0
>> [ 966.860952] unregister_netdevice_many+0x18/0x24
>> [ 966.865560] macsec_notify+0x1ac/0x1c0 [ 966.869303]
>> raw_notifier_call_chain+0x50/0x70 [ 966.873738]
>> call_netdevice_notifiers_info+0x34/0x7c
>> [ 966.878694] rollback_registered_many+0x354/0x5bc
>> [ 966.883390] unregister_netdevice_queue+0x88/0x10c
>> [ 966.888173] unregister_netdev+0x20/0x30 [ 966.892090]
>> otx2_remove+0x8c/0x310 [ 966.895571] pci_device_shutdown+0x30/0x70 [
>> 966.899660] device_shutdown+0x11c/0x204 [ 966.903574]
>> __do_sys_reboot+0x208/0x290 [ 966.907487]
>> __arm64_sys_reboot+0x20/0x30 [ 966.911489]
>> el0_svc_handler+0x80/0x1c0 [ 966.915316] el0_svc+0x8/0x180 [
>> 966.918362] Code: f9400000 f9400a64 91220014 f94b3403 (f9400060) [
>> 966.924448] ---[ end trace 341778e799c3d8d7 ]---
>>
>> Fixes: c54ffc73601c ("octeontx2-pf: mcs: Introduce MACSEC hardware
>> offloading")
>> Signed-off-by: Subbaraya Sundeep <sbhatta@...vell.com>
>> Signed-off-by: Sunil Goutham <sgoutham@...vell.com>
>> Signed-off-by: Geetha sowjanya <gakula@...vell.com>
>> ---
>> drivers/net/ethernet/marvell/octeontx2/nic/cn10k_macsec.c | 6 ++++++
>> 1 file changed, 6 insertions(+)
>>
>> diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/cn10k_macsec.c
>> b/drivers/net/ethernet/marvell/octeontx2/nic/cn10k_macsec.c
>> index 9ec5f38d38a8..5f4402f7b03e 100644
>> --- a/drivers/net/ethernet/marvell/octeontx2/nic/cn10k_macsec.c
>> +++ b/drivers/net/ethernet/marvell/octeontx2/nic/cn10k_macsec.c
>> @@ -1065,6 +1065,9 @@ static int cn10k_mdo_stop(struct macsec_context
>*ctx)
>> struct cn10k_mcs_txsc *txsc;
>> int err;
>>
>> + if (!cfg)
>> + return 0;
>> +
>> txsc = cn10k_mcs_get_txsc(cfg, ctx->secy);
>> if (!txsc)
>> return -ENOENT;
>> @@ -1146,6 +1149,9 @@ static int cn10k_mdo_del_secy(struct
>macsec_context *ctx)
>> struct cn10k_mcs_cfg *cfg = pfvf->macsec_cfg;
>> struct cn10k_mcs_txsc *txsc;
>>
>> + if (!cfg)
>> + return 0;
>
>How did you get call to .mdo_del_secy if you didn't add any secy?
>
>Thanks
>
It is because of the order of teardown in otx2_remove:
cn10k_mcs_free(pf);
unregister_netdev(netdev);
cn10k_mcs_free free the resources and makes cfg as NULL.
Later unregister_netdev calls mdo_del_secy and finds cfg as NULL.
Thanks for the review I will change the order and submit next version.
Sundeep
>> +
>> txsc = cn10k_mcs_get_txsc(cfg, ctx->secy);
>> if (!txsc)
>> return -ENOENT;
>> --
>> 2.25.1
>>
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