From: zzam@gentoo.org
To: Wei Chen <harperchen1110@gmail.com>,
Mauro Carvalho Chehab <mchehab@kernel.org>
Cc: Antti Palosaari <crope@iki.fi>,
linux-kernel@vger.kernel.org, linux-media@vger.kernel.org
Subject: Re: [PATCH 05/24] media: dvb-usb-v2: ec168: fix null-ptr-deref in ec168_i2c_xfer()
Date: Fri, 2 Jun 2023 08:41:47 +0200 [thread overview]
Message-ID: <c5e51a20-9fa4-3fa9-ee14-3410778e4dcf@gentoo.org> (raw)
In-Reply-To: <em460c2fef-d14b-4cd9-97dd-ef7b52090a48@bb0cba59.com>
Am 19.05.23 um 11:17 schrieb Wei Chen:
> Dear Linux Developers,
>
Hi Wei,
> Thank you for the review for my patch in driver az6027 and ec168.
>
> Yes, I agree with you. Sorry for my mistake. Since these two patches has
> already been accepted and merged in git tree media, should I send a new
> patch to revise this problem? Or how could I revise an accepted patch?
I think the best is to send new patches on top of the already accepted
patches.
Regards
Matthias
>
> Thanks,
> Wei
>
>
> ------ Original Message ------
>> From zzam@gentoo.org
> To "Mauro Carvalho Chehab" <mchehab@kernel.org>
> Cc "Wei Chen" <harperchen1110@gmail.com>; "Antti Palosaari"
> <crope@iki.fi>; linux-kernel@vger.kernel.org; linux-media@vger.kernel.org
> Date 2023/5/17 13:10:34
> Subject Re: [PATCH 05/24] media: dvb-usb-v2: ec168: fix null-ptr-deref
> in ec168_i2c_xfer()
>
>> Am 13.05.23 um 19:57 schrieb Mauro Carvalho Chehab:
>>> From: Wei Chen <harperchen1110@gmail.com>
>>>
>>> In ec168_i2c_xfer, msg is controlled by user. When msg[i].buf is null
>>> and msg[i].len is zero, former checks on msg[i].buf would be passed.
>>> If accessing msg[i].buf[0] without sanity check, null pointer deref
>>> would happen. We add check on msg[i].len to prevent crash.
>>>
>>> Similar commit:
>>> commit 0ed554fd769a ("media: dvb-usb: az6027: fix null-ptr-deref in
>>> az6027_i2c_xfer()")
>>>
>> Review comment below.
>>
>>> Link:
>>> https://lore.kernel.org/linux-media/20230313085853.3252349-1-harperchen1110@gmail.com
>>> Signed-off-by: Wei Chen <harperchen1110@gmail.com>
>>> Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
>>> ---
>>> drivers/media/usb/dvb-usb-v2/ec168.c | 12 ++++++++++++
>>> 1 file changed, 12 insertions(+)
>>>
>>> diff --git a/drivers/media/usb/dvb-usb-v2/ec168.c
>>> b/drivers/media/usb/dvb-usb-v2/ec168.c
>>> index 7ed0ab9e429b..0e4773fc025c 100644
>>> --- a/drivers/media/usb/dvb-usb-v2/ec168.c
>>> +++ b/drivers/media/usb/dvb-usb-v2/ec168.c
>>> @@ -115,6 +115,10 @@ static int ec168_i2c_xfer(struct i2c_adapter
>>> *adap, struct i2c_msg msg[],
>>> while (i < num) {
>>> if (num > i + 1 && (msg[i+1].flags & I2C_M_RD)) {
>>> if (msg[i].addr == ec168_ec100_config.demod_address) {
>>> + if (msg[i].len < 1) {
>>> + i = -EOPNOTSUPP;
>>> + break;
>>> + }
>>> req.cmd = READ_DEMOD;
>>> req.value = 0;
>>> req.index = 0xff00 + msg[i].buf[0]; /* reg */
>>> @@ -131,6 +135,10 @@ static int ec168_i2c_xfer(struct i2c_adapter
>>> *adap, struct i2c_msg msg[],
>>> }
>>> } else {
>>> if (msg[i].addr == ec168_ec100_config.demod_address) {
>>> + if (msg[i].len < 1) {
>>> + i = -EOPNOTSUPP;
>>> + break;
>>> + }
>> The check condition should be msg[i].len < 2 or != 2. The following
>> lines access msg[i].buf elements 0 and 1.
>>> req.cmd = WRITE_DEMOD;
>>> req.value = msg[i].buf[1]; /* val */
>>> req.index = 0xff00 + msg[i].buf[0]; /* reg */
>>> @@ -139,6 +147,10 @@ static int ec168_i2c_xfer(struct i2c_adapter
>>> *adap, struct i2c_msg msg[],
>>> ret = ec168_ctrl_msg(d, &req);
>>> i += 1;
>>> } else {
>>> + if (msg[i].len < 1) {
>>> + i = -EOPNOTSUPP;
>>> + break;
>>> + }
>>> req.cmd = WRITE_I2C;
>>> req.value = msg[i].buf[0]; /* val */
>>> req.index = 0x0100 + msg[i].addr; /* I2C addr */
>>
next prev parent reply other threads:[~2023-06-02 6:41 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-13 17:57 [PATCH 01/24] media: pvrusb2: fix DVB_CORE dependency Mauro Carvalho Chehab
2023-05-13 17:57 ` [PATCH 02/24] media: dvb_demux: fix a bug for the continuity counter Mauro Carvalho Chehab
2023-05-13 17:57 ` [PATCH 03/24] media: netup_unidvb: fix use-after-free bug caused by del_timer() Mauro Carvalho Chehab
2023-05-13 17:57 ` [PATCH 04/24] media: dvb-usb: az6027: fix three null-ptr-deref in az6027_i2c_xfer() Mauro Carvalho Chehab
2023-05-17 5:06 ` zzam
2023-05-13 17:57 ` [PATCH 05/24] media: dvb-usb-v2: ec168: fix null-ptr-deref in ec168_i2c_xfer() Mauro Carvalho Chehab
2023-05-17 5:10 ` zzam
2023-05-19 9:17 ` Wei Chen
2023-06-02 6:41 ` zzam [this message]
2023-05-13 17:57 ` [PATCH 06/24] media: dvb-usb-v2: ce6230: fix null-ptr-deref in ce6230_i2c_master_xfer() Mauro Carvalho Chehab
2023-05-13 17:57 ` [PATCH 07/24] media: dvb-usb-v2: rtl28xxu: fix null-ptr-deref in rtl28xxu_i2c_xfer Mauro Carvalho Chehab
2023-05-17 6:55 ` zzam
2023-05-13 17:57 ` [PATCH 08/24] media: dvb-usb: digitv: fix null-ptr-deref in digitv_i2c_xfer() Mauro Carvalho Chehab
2023-05-13 17:57 ` [PATCH 09/24] media: dvb-usb: dw2102: fix uninit-value in su3000_read_mac_address Mauro Carvalho Chehab
2023-05-13 17:57 ` [PATCH 10/24] media: netup_unidvb: fix irq init by register it at the end of probe Mauro Carvalho Chehab
2023-05-13 17:57 ` [PATCH 11/24] media: dvb_ca_en50221: fix a size write bug Mauro Carvalho Chehab
2023-05-13 17:57 ` [PATCH 12/24] media: ttusb-dec: fix memory leak in ttusb_dec_exit_dvb() Mauro Carvalho Chehab
2023-05-13 17:57 ` [PATCH 13/24] media: mn88443x: fix !CONFIG_OF error by drop of_match_ptr from ID table Mauro Carvalho Chehab
2023-05-13 17:57 ` [PATCH 14/24] media: dvb-core: Fix use-after-free due to race condition occurring in dvb_frontend Mauro Carvalho Chehab
2023-05-13 17:57 ` [PATCH 15/24] media: dvb-core: Fix use-after-free due to race condition occurring in dvb_net Mauro Carvalho Chehab
2023-05-13 17:57 ` [PATCH 16/24] media: dvb-core: Fix use-after-free due to race condition occurring in dvb_register_device() Mauro Carvalho Chehab
2023-05-13 17:57 ` [PATCH 17/24] media: dvb-core: Fix kernel WARNING for blocking operation in wait_event*() Mauro Carvalho Chehab
2023-05-13 17:57 ` [PATCH 18/24] media: dvbdev: fix most coding style issues Mauro Carvalho Chehab
2023-05-13 17:57 ` [PATCH 19/24] media: dvbdev.h: do some kernel-doc cleanups Mauro Carvalho Chehab
2023-05-13 17:57 ` [PATCH 20/24] media: c8sectpfe: dvb: remove unnecessary (void*) conversions Mauro Carvalho Chehab
2023-05-13 17:57 ` [PATCH 21/24] media: dvb-usb: " Mauro Carvalho Chehab
2023-05-13 17:57 ` [PATCH 22/24] media: dw2102: return -EIO instead of -1 for mac address read errors Mauro Carvalho Chehab
2023-05-13 17:57 ` [PATCH 23/24] media: dvb: add missing DVB-S2X FEC parameter values Mauro Carvalho Chehab
2023-05-13 17:57 ` [PATCH 24/24] media: dvb: bump DVB API version Mauro Carvalho Chehab
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