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| author | Jonathan Cameron <jic23@kernel.org> | 2014-01-03 23:24:00 +0100 |
|---|---|---|
| committer | Jonathan Cameron <jic23@kernel.org> | 2014-03-16 19:00:35 +0100 |
| commit | ef4b4856593fc3d9d169bededdaf7acf62f83a52 (patch) | |
| tree | 475540e4f92024899b4ab3b4b2469b9884503ff5 /drivers/iio/industrialio-event.c | |
| parent | Add support for Microchip Technology's MCP3426/7/8 ADC (diff) | |
| download | linux-ef4b4856593fc3d9d169bededdaf7acf62f83a52.tar.xz linux-ef4b4856593fc3d9d169bededdaf7acf62f83a52.zip | |
iio:core: Fix bug in length of event info_mask and catch unhandled bits set in masks.
The unhandled bits case was highlighted by smatch:
CHECK drivers/iio/industrialio-core.c
drivers/iio/industrialio-core.c:719 iio_device_add_info_mask_type() error: buffer overflow 'iio_chan_info_postfix' 17 <= 31
CC [M] drivers/iio/industrialio-core.o
CHECK drivers/iio/industrialio-event.c
drivers/iio/industrialio-event.c:327 iio_device_add_event() error: buffer overflow 'iio_ev_info_text' 3 <= 3
The incorrect limit for the for_each_set_bit loop was noticed whilst fixing
this other case. Note that as we only have 3 possible entries a the moment
and the value was set to 4, the bug would not have any effect currently.
It will bite fairly soon though, so best fix it now.
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Diffstat (limited to 'drivers/iio/industrialio-event.c')
| -rw-r--r-- | drivers/iio/industrialio-event.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/iio/industrialio-event.c b/drivers/iio/industrialio-event.c index ea6e06b9c7d4..dddfb0f90d34 100644 --- a/drivers/iio/industrialio-event.c +++ b/drivers/iio/industrialio-event.c @@ -321,7 +321,9 @@ static int iio_device_add_event(struct iio_dev *indio_dev, char *postfix; int ret; - for_each_set_bit(i, mask, sizeof(*mask)) { + for_each_set_bit(i, mask, sizeof(*mask)*8) { + if (i >= ARRAY_SIZE(iio_ev_info_text)) + return -EINVAL; postfix = kasprintf(GFP_KERNEL, "%s_%s_%s", iio_ev_type_text[type], iio_ev_dir_text[dir], iio_ev_info_text[i]); |