hwmon: (w83792d) Fix NULL pointer dereference by removing unnecessary structure field
JIRA: https://issues.redhat.com/browse/RHEL-37721
CVE: CVE-2021-47385
Build Info: https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=61470814
Tested: Did sanity boot testing Intel (intel-arrowlake-s-02) system.
commit 0f36b88173f028e372668ae040ab1a496834d278
Author: Nadezda Lutovinova lutovinova@ispras.ru
Date: Tue Sep 21 18:51:52 2021 +0300
hwmon: (w83792d) Fix NULL pointer dereference by removing unnecessary structure field
If driver read val value sufficient for
(val & 0x08) && (!(val & 0x80)) && ((val & 0x7) == ((val >> 4) & 0x7))
from device then Null pointer dereference occurs.
(It is possible if tmp = 0b0xyz1xyz, where same literals mean same numbers)
Also lm75[] does not serve a purpose anymore after switching to
devm_i2c_new_dummy_device() in w83791d_detect_subclients().
The patch fixes possible NULL pointer dereference by removing lm75[].
Found by Linux Driver Verification project (linuxtesting.org).
Cc: stable@vger.kernel.org
Signed-off-by: Nadezda Lutovinova <lutovinova@ispras.ru>
Link: https://lore.kernel.org/r/20210921155153.28098-2-lutovinova@ispras.ru
[groeck: Dropped unnecessary continuation lines, fixed multipline alignment]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Steve Best sbest@redhat.com