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| author | Pan Bian <bianpan2016@163.com> | 2019-11-12 17:04:54 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-12-13 08:48:35 +0100 |
| commit | 47c7888200bcb909b673bf080d52c05c90e4320d (patch) | |
| tree | 41c4d624536a8d8098ebe8c438d0519a53093a8e | |
| parent | bc6024b4273dcb39eebc0fc26de164185d1933cd (diff) | |
| download | linux-stable-47c7888200bcb909b673bf080d52c05c90e4320d.tar.gz linux-stable-47c7888200bcb909b673bf080d52c05c90e4320d.tar.bz2 linux-stable-47c7888200bcb909b673bf080d52c05c90e4320d.zip | |
Input: cyttsp4_core - fix use after free bug
[ 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>
| -rw-r--r-- | drivers/input/touchscreen/cyttsp4_core.c | 7 |
1 files changed, 0 insertions, 7 deletions
diff --git a/drivers/input/touchscreen/cyttsp4_core.c b/drivers/input/touchscreen/cyttsp4_core.c index 4b22d49a0f49..6bcffc930384 100644 --- a/drivers/input/touchscreen/cyttsp4_core.c +++ b/drivers/input/touchscreen/cyttsp4_core.c @@ -1990,11 +1990,6 @@ 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) @@ -2004,8 +1999,6 @@ 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; |