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| author | Guenter Roeck <linux@roeck-us.net> | 2022-08-08 11:48:21 +0200 |
|---|---|---|
| committer | Guenter Roeck <linux@roeck-us.net> | 2022-08-10 09:49:46 +0200 |
| commit | 7aeef1548ac026c8bcb9ec223b672f81da340011 (patch) | |
| tree | 92b64297e8031f5853af6f724c70bf141af9e13f | |
| parent | add barriers to buffer_uptodate and set_buffer_uptodate (diff) | |
| download | linux-7aeef1548ac026c8bcb9ec223b672f81da340011.tar.xz linux-7aeef1548ac026c8bcb9ec223b672f81da340011.zip | |
hwmon: (lm90) Fix error return value from detect function
lm90_detect_nuvoton() is supposed to return NULL if it can not detect
a chip, or a pointer to the chip name if it does. Under some circumstances
it returns an error pointer instead. Some versions of gcc interpret an
ERR_PTR as region of size 0 and generate an error message.
In function ‘__fortify_strlen’,
inlined from ‘strlcpy’ at ./include/linux/fortify-string.h:159:10,
inlined from ‘lm90_detect’ at drivers/hwmon/lm90.c:2550:2:
./include/linux/fortify-string.h:50:33: error:
‘__builtin_strlen’ reading 1 or more bytes from a region of size 0
50 | #define __underlying_strlen __builtin_strlen
| ^
./include/linux/fortify-string.h:141:24: note:
in expansion of macro ‘__underlying_strlen’
141 | return __underlying_strlen(p);
| ^~~~~~~~~~~~~~~~~~~
Returning NULL instead of ERR_PTR() fixes the problem.
Fixes: c7cebce984a2 ("hwmon: (lm90) Rework detect function")
Reported-by: Ingo Molnar <mingo@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Kees Cook <keescook@chromium.org>
Tested-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
| -rw-r--r-- | drivers/hwmon/lm90.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/hwmon/lm90.c b/drivers/hwmon/lm90.c index 03d07da8c2dc..221de01a327a 100644 --- a/drivers/hwmon/lm90.c +++ b/drivers/hwmon/lm90.c @@ -2321,7 +2321,7 @@ static const char *lm90_detect_nuvoton(struct i2c_client *client, int chip_id, const char *name = NULL; if (config2 < 0) - return ERR_PTR(-ENODEV); + return NULL; if (address == 0x4c && !(config1 & 0x2a) && !(config2 & 0xf8)) { if (chip_id == 0x01 && convrate <= 0x09) { |