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Input: cyttsp4_core - fix use after free bug 

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>
alistair/sunxi64-5.4-dsi
Pan Bian 2019-11-12 17:04:54 -08:00 committed by Dmitry Torokhov
parent 549766ac2a
commit 79aae6acbe
1 changed files with 0 additions and 7 deletions
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7
drivers/input/touchscreen/cyttsp4_core.c
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@ -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;