hwmon: (nct6775-platform) Explicitly initialize nct6775_sio_names indexes
authorKees Cook <keescook@chromium.org>
Thu, 16 Nov 2023 14:01:47 +0000 (06:01 -0800)
committerGuenter Roeck <linux@roeck-us.net>
Mon, 11 Dec 2023 14:20:28 +0000 (06:20 -0800)
commitefe86092ab316db8d3c6e98f57b193511a09a073
tree025c4c5b5abf46a90c1cceb07e5521546ad6054f
parent10a0575ea09dbc333ee952b707ea216020d8f77c
hwmon: (nct6775-platform) Explicitly initialize nct6775_sio_names indexes

Changing the "kinds" enum start value to be 1-indexed instead of
0-indexed caused look-ups in nct6775_sio_namesp[] to be misaligned or
off the end. Coverity reported:

*** CID 1571052:  Memory - illegal accesses  (OVERRUN)
drivers/hwmon/nct6775-platform.c:1075 in nct6775_find()
1069                sio_data->kind == nct6793 || sio_data->kind == nct6795 ||
1070                sio_data->kind == nct6796 || sio_data->kind == nct6797 ||
1071                sio_data->kind == nct6798 || sio_data->kind == nct6799)
1072                    nct6791_enable_io_mapping(sio_data);
1073
1074            sio_data->sio_exit(sio_data);
vvv     CID 1571052:  Memory - illegal accesses  (OVERRUN)
vvv     Overrunning array "nct6775_sio_names" of 13 8-byte elements at element index 13 (byte offset 111) using index "sio_data->kind" (which evaluates to 13).
1075            pr_info("Found %s or compatible chip at %#x:%#x\n",
1076                    nct6775_sio_names[sio_data->kind], sioaddr, addr);
1077
1078            return addr;
1079     }
1080

Initialize the string list with explicit indexes.

Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Rob Herring <robh@kernel.org>
Cc: Jean Delvare <jdelvare@suse.com>
Cc: linux-hwmon@vger.kernel.org
Fixes: 10a0575ea09d ("hwmon: nct6775-i2c: Use i2c_get_match_data()")
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20231116140144.work.027-kees@kernel.org
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
drivers/hwmon/nct6775-platform.c