From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Pan Bian <bianpan2016@163.com>,
Dmitry Torokhov <dmitry.torokhov@gmail.com>,
Sasha Levin <sashal@kernel.org>,
linux-input@vger.kernel.org
Subject: [PATCH AUTOSEL 4.19 09/25] Input: cyttsp4_core - fix use after free bug
Date: Fri, 22 Nov 2019 14:48:42 -0500 [thread overview]
Message-ID: <20191122194859.24508-9-sashal@kernel.org> (raw)
In-Reply-To: <20191122194859.24508-1-sashal@kernel.org>
From: Pan Bian <bianpan2016@163.com>
[ Upstream commit 79aae6acbef16f720a7949f8fc6ac69816c79d62 ]
The device md->input is used after it is released. Setting the device
data to NULL is unnecessary as the device is never used again. Instead,
md->input should be assigned NULL to avoid accessing the freed memory
accidently. Besides, checking md->si against NULL is superfluous as it
points to a variable address, which cannot be NULL.
Signed-off-by: Pan Bian <bianpan2016@163.com>
Link: https://lore.kernel.org/r/1572936379-6423-1-git-send-email-bianpan2016@163.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/input/touchscreen/cyttsp4_core.c | 7 -------
1 file changed, 7 deletions(-)
diff --git a/drivers/input/touchscreen/cyttsp4_core.c b/drivers/input/touchscreen/cyttsp4_core.c
index 727c3232517cd..c84ee739a8d50 100644
--- a/drivers/input/touchscreen/cyttsp4_core.c
+++ b/drivers/input/touchscreen/cyttsp4_core.c
@@ -2000,11 +2000,6 @@ static int cyttsp4_mt_probe(struct cyttsp4 *cd)
/* get sysinfo */
md->si = &cd->sysinfo;
- if (!md->si) {
- dev_err(dev, "%s: Fail get sysinfo pointer from core p=%p\n",
- __func__, md->si);
- goto error_get_sysinfo;
- }
rc = cyttsp4_setup_input_device(cd);
if (rc)
@@ -2014,8 +2009,6 @@ static int cyttsp4_mt_probe(struct cyttsp4 *cd)
error_init_input:
input_free_device(md->input);
-error_get_sysinfo:
- input_set_drvdata(md->input, NULL);
error_alloc_failed:
dev_err(dev, "%s failed.\n", __func__);
return rc;
--
2.20.1
next prev parent reply other threads:[~2019-11-22 19:49 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-22 19:48 [PATCH AUTOSEL 4.19 01/25] autofs: fix a leak in autofs_expire_indirect() Sasha Levin
2019-11-22 19:48 ` [PATCH AUTOSEL 4.19 02/25] RDMA/hns: Correct the value of HNS_ROCE_HEM_CHUNK_LEN Sasha Levin
2019-11-22 19:48 ` [PATCH AUTOSEL 4.19 03/25] xfrm: Fix memleak on xfrm state destroy Sasha Levin
2019-11-22 19:48 ` [PATCH AUTOSEL 4.19 04/25] iwlwifi: pcie: don't consider IV len in A-MSDU Sasha Levin
2019-11-22 19:48 ` [PATCH AUTOSEL 4.19 05/25] exportfs_decode_fh(): negative pinned may become positive without the parent locked Sasha Levin
2019-11-22 19:48 ` [PATCH AUTOSEL 4.19 06/25] audit_get_nd(): don't unlock parent too early Sasha Levin
2019-11-22 19:48 ` [PATCH AUTOSEL 4.19 07/25] NFC: nxp-nci: Fix NULL pointer dereference after I2C communication error Sasha Levin
2019-11-22 19:48 ` [PATCH AUTOSEL 4.19 08/25] xfrm: release device reference for invalid state Sasha Levin
2019-11-22 19:48 ` Sasha Levin [this message]
2019-11-22 19:48 ` [PATCH AUTOSEL 4.19 10/25] sched/core: Avoid spurious lock dependencies Sasha Levin
2019-11-22 19:48 ` [PATCH AUTOSEL 4.19 11/25] perf/core: Consistently fail fork on allocation failures Sasha Levin
2019-11-22 19:48 ` [PATCH AUTOSEL 4.19 12/25] ALSA: pcm: Fix stream lock usage in snd_pcm_period_elapsed() Sasha Levin
2019-11-22 19:48 ` [PATCH AUTOSEL 4.19 13/25] drm/sun4i: tcon: Set min division of TCON0_DCLK to 1 Sasha Levin
2019-11-22 19:48 ` [PATCH AUTOSEL 4.19 14/25] selftests: kvm: fix build with glibc >= 2.30 Sasha Levin
2019-11-22 19:48 ` [PATCH AUTOSEL 4.19 15/25] net: usb: qmi_wwan: add support for Foxconn T77W968 LTE modules Sasha Levin
2019-11-22 19:48 ` [PATCH AUTOSEL 4.19 16/25] slip: Fix memory leak in slip_open error path Sasha Levin
2019-11-22 19:48 ` [PATCH AUTOSEL 4.19 17/25] net: cdc_ncm: Signedness bug in cdc_ncm_set_dgram_size() Sasha Levin
2019-11-22 19:48 ` [PATCH AUTOSEL 4.19 18/25] slcan: Fix memory leak in error path Sasha Levin
2019-11-22 19:48 ` [PATCH AUTOSEL 4.19 19/25] rsxx: add missed destroy_workqueue calls in remove Sasha Levin
2019-11-22 19:48 ` [PATCH AUTOSEL 4.19 20/25] ax88172a: fix information leak on short answers Sasha Levin
2019-11-22 19:48 ` [PATCH AUTOSEL 4.19 21/25] net: ep93xx_eth: fix mismatch of request_mem_region in remove Sasha Levin
2019-11-22 19:48 ` [PATCH AUTOSEL 4.19 22/25] i2c: acpi: Force bus speed to 400KHz if a Silead touchscreen is present Sasha Levin
2019-11-22 19:48 ` [PATCH AUTOSEL 4.19 23/25] i2c: core: fix use after free in of_i2c_notify Sasha Levin
2019-11-22 19:48 ` [PATCH AUTOSEL 4.19 24/25] Input: synaptics - enable RMI mode for X1 Extreme 2nd Generation Sasha Levin
2019-11-22 19:55 ` Dmitry Torokhov
2019-12-06 12:14 ` Sasha Levin
2019-11-22 19:48 ` [PATCH AUTOSEL 4.19 25/25] net: gemini: add missed free_netdev Sasha Levin
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