From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Zhang Shurong <zhang_shurong@foxmail.com>,
Hans Verkuil <hverkuil-cisco@xs4all.nl>,
Sasha Levin <sashal@kernel.org>,
mchehab@kernel.org, linux-media@vger.kernel.org
Subject: [PATCH AUTOSEL 4.14 05/12] media: az6007: Fix null-ptr-deref in az6007_i2c_xfer()
Date: Fri, 8 Sep 2023 20:41:08 -0400 [thread overview]
Message-ID: <20230909004115.3581195-5-sashal@kernel.org> (raw)
In-Reply-To: <20230909004115.3581195-1-sashal@kernel.org>
From: Zhang Shurong <zhang_shurong@foxmail.com>
[ Upstream commit 1047f9343011f2cedc73c64829686206a7e9fc3f ]
In az6007_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. Malicious data finally reach az6007_i2c_xfer. If accessing
msg[i].buf[0] without sanity check, null ptr 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()")
Signed-off-by: Zhang Shurong <zhang_shurong@foxmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/media/usb/dvb-usb-v2/az6007.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/media/usb/dvb-usb-v2/az6007.c b/drivers/media/usb/dvb-usb-v2/az6007.c
index 1830badb180d8..668b6091b4423 100644
--- a/drivers/media/usb/dvb-usb-v2/az6007.c
+++ b/drivers/media/usb/dvb-usb-v2/az6007.c
@@ -796,6 +796,10 @@ static int az6007_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[],
if (az6007_xfer_debug)
printk(KERN_DEBUG "az6007: I2C W addr=0x%x len=%d\n",
addr, msgs[i].len);
+ if (msgs[i].len < 1) {
+ ret = -EIO;
+ goto err;
+ }
req = AZ6007_I2C_WR;
index = msgs[i].buf[0];
value = addr | (1 << 8);
@@ -810,6 +814,10 @@ static int az6007_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[],
if (az6007_xfer_debug)
printk(KERN_DEBUG "az6007: I2C R addr=0x%x len=%d\n",
addr, msgs[i].len);
+ if (msgs[i].len < 1) {
+ ret = -EIO;
+ goto err;
+ }
req = AZ6007_I2C_RD;
index = msgs[i].buf[0];
value = addr;
--
2.40.1
next prev parent reply other threads:[~2023-09-09 0:59 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-09 0:41 [PATCH AUTOSEL 4.14 01/12] media: dvb-usb-v2: af9035: Fix null-ptr-deref in af9035_i2c_master_xfer Sasha Levin
2023-09-09 0:41 ` [PATCH AUTOSEL 4.14 02/12] media: dw2102: Fix null-ptr-deref in dw2102_i2c_transfer() Sasha Levin
2023-09-09 0:41 ` [PATCH AUTOSEL 4.14 03/12] media: af9005: Fix null-ptr-deref in af9005_i2c_xfer Sasha Levin
2023-09-09 0:41 ` [PATCH AUTOSEL 4.14 04/12] media: anysee: fix null-ptr-deref in anysee_master_xfer Sasha Levin
2023-09-09 0:41 ` Sasha Levin [this message]
2023-09-09 0:41 ` [PATCH AUTOSEL 4.14 06/12] iio: core: Use min() instead of min_t() to make code more robust Sasha Levin
2023-09-10 13:23 ` Jonathan Cameron
2023-09-09 0:41 ` [PATCH AUTOSEL 4.14 07/12] media: tuners: qt1010: replace BUG_ON with a regular error Sasha Levin
2023-09-09 0:41 ` [PATCH AUTOSEL 4.14 08/12] media: pci: cx23885: replace BUG with error return Sasha Levin
2023-09-09 0:41 ` [PATCH AUTOSEL 4.14 09/12] usb: gadget: fsl_qe_udc: validate endpoint index for ch9 udc Sasha Levin
2023-09-09 0:41 ` [PATCH AUTOSEL 4.14 10/12] scsi: target: iscsi: Fix buffer overflow in lio_target_nacl_info_show() Sasha Levin
2023-09-09 0:41 ` [PATCH AUTOSEL 4.14 11/12] serial: cpm_uart: Avoid suspicious locking Sasha Levin
2023-09-09 0:41 ` [PATCH AUTOSEL 4.14 12/12] kobject: Add sanity check for kset->kobj.ktype in kset_register() Sasha Levin
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