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hwmon: (ftsteutates) Fix potential memory access error

Message ID 1469546388-29907-1-git-send-email-linux@roeck-us.net
State Accepted
Headers show

Commit Message

Guenter Roeck July 26, 2016, 3:19 p.m. UTC
Using set_bit() to set a bit in an integer is not a good idea, since
the function expects an unsigned long as argument, which can be 64 bit
wide. Coverity reports this problem as

>>>     CID 1364488:  Memory - illegal accesses  (INCOMPATIBLE_CAST)
>>>     Pointer "&ret" points to an object whose effective type is "int"
>>>	(32 bits, signed) but is dereferenced as a wider "unsigned
+long" (64 bits, unsigned).  This may lead to memory corruption.
245                     set_bit(1, (unsigned long *)&ret);

Just use BIT instead.

Cc: Thilo Cestonaro <thilo@cestona.ro>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
 drivers/hwmon/ftsteutates.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/drivers/hwmon/ftsteutates.c b/drivers/hwmon/ftsteutates.c
index 2b2ff67026be..48633e541dc3 100644
--- a/drivers/hwmon/ftsteutates.c
+++ b/drivers/hwmon/ftsteutates.c
@@ -242,7 +242,7 @@  static int fts_wd_set_resolution(struct fts_data *data,
 	if (resolution == seconds)
-		set_bit(1, (unsigned long *)&ret);
+		ret |= BIT(1);
 		ret &= ~BIT(1);