From: Lars-Peter Clausen Date: Wed, 2 Nov 2011 08:40:01 +0000 (+0100) Subject: staging:iio: IIO_EVENT_CODE: Clamp channel numbers X-Git-Tag: firefly_0821_release~3680^2~3804^2~101^2~323 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=19c2aedc54b927ab10d3723038182eedf90438a4;p=firefly-linux-kernel-4.4.55.git staging:iio: IIO_EVENT_CODE: Clamp channel numbers Make sure we only use the allotted space for channel numbers in the event mask and do not let them override other fields. Since negative values are valid channel number, cast the channel number to signed when extracting it from an event mask. Signed-off-by: Lars-Peter Clausen Acked-by: Jonathan Cameron Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/staging/iio/events.h b/drivers/staging/iio/events.h index 92759547b410..bfb63400fa60 100644 --- a/drivers/staging/iio/events.h +++ b/drivers/staging/iio/events.h @@ -56,7 +56,8 @@ enum iio_event_direction { type, chan, chan1, chan2) \ (((u64)type << 56) | ((u64)diff << 55) | \ ((u64)direction << 48) | ((u64)modifier << 40) | \ - ((u64)chan_type << 32) | (chan2 << 16) | chan1 | chan) + ((u64)chan_type << 32) | (((u16)chan2) << 16) | ((u16)chan1) | \ + ((u16)chan)) #define IIO_EV_DIR_MAX 4 @@ -95,7 +96,7 @@ enum iio_event_direction { /* Event code number extraction depends on which type of event we have. * Perhaps review this function in the future*/ -#define IIO_EVENT_CODE_EXTRACT_NUM(mask) (mask & 0xFFFF) +#define IIO_EVENT_CODE_EXTRACT_NUM(mask) ((__s16)(mask & 0xFFFF)) #define IIO_EVENT_CODE_EXTRACT_MODIFIER(mask) ((mask >> 40) & 0xFF)