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>

diff --git a/drivers/hwmon/nct6775-platform.c b/drivers/hwmon/nct6775-platform.c
index 0adeeab7ee03c08be49bf073941137312cd7e006..9aa4dcf4a6f3365f31225020a50b67185b23b94c 100644 (file)
--- a/drivers/hwmon/nct6775-platform.c
+++ b/drivers/hwmon/nct6775-platform.c
@@ -23,19 +23,19 @@
 enum sensor_access { access_direct, access_asuswmi };
 
 static const char * const nct6775_sio_names[] __initconst = {
-       "NCT6106D",
-       "NCT6116D",
-       "NCT6775F",
-       "NCT6776D/F",
-       "NCT6779D",
-       "NCT6791D",
-       "NCT6792D",
-       "NCT6793D",
-       "NCT6795D",
-       "NCT6796D",
-       "NCT6797D",
-       "NCT6798D",
-       "NCT6796D-S/NCT6799D-R",
+       [nct6106] = "NCT6106D",
+       [nct6116] = "NCT6116D",
+       [nct6775] = "NCT6775F",
+       [nct6776] = "NCT6776D/F",
+       [nct6779] = "NCT6779D",
+       [nct6791] = "NCT6791D",
+       [nct6792] = "NCT6792D",
+       [nct6793] = "NCT6793D",
+       [nct6795] = "NCT6795D",
+       [nct6796] = "NCT6796D",
+       [nct6797] = "NCT6797D",
+       [nct6798] = "NCT6798D",
+       [nct6799] = "NCT6796D-S/NCT6799D-R",
 };
 
 static unsigned short force_id;