3.16.52-rc1 review patch. If anyone has any objections, please let me know.
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From: Colin Ian King <colin.king@xxxxxxxxxxxxx>
commit 13ffe9a26df4e156363579b25c904dd0b1e31bfb upstream.
The current shift of st->rx[2] left shifts a u8 24 bits left,
promotes the integer to a an int and then to a unsigned u64. If
the top bit of st->rx[2] is set then we end up with all the upper
bits being set to 1. Fix this by casting st->rx[2] to a u64 before
the 24 bit left shift.
Detected by CoverityScan CID#144940 ("Unintended sign extension")
Fixes: 2919fa54ef64 ("staging: iio: meter: new driver for ADE7759 devices")
Signed-off-by: Colin Ian King <colin.king@xxxxxxxxxxxxx>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
drivers/staging/iio/meter/ade7759.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/staging/iio/meter/ade7759.c
+++ b/drivers/staging/iio/meter/ade7759.c
@@ -124,7 +124,7 @@ static int ade7759_spi_read_reg_40(struc
reg_address);
goto error_ret;
}
- *val = ((u64)st->rx[1] << 32) | (st->rx[2] << 24) |
+ *val = ((u64)st->rx[1] << 32) | ((u64)st->rx[2] << 24) |
(st->rx[3] << 16) | (st->rx[4] << 8) | st->rx[5];
error_ret: