diff options
| author |   Mauro Carvalho Chehab <mchehab@s-opensource.com> | 2017-06-26 14:07:54 -0400 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@s-opensource.com> | 2017-07-20 16:26:21 -0400 |
| commit | 4ee236219f6da367093b503b52fcceb609397c6f (patch) | |
| tree | d7c7b6acba03202f54f9434b827ebcafefcda9df | |
| parent | media: pvrusb2: fix the retry logic (diff) | |
| download | wireguard-linux-4ee236219f6da367093b503b52fcceb609397c6f.tar.xz wireguard-linux-4ee236219f6da367093b503b52fcceb609397c6f.zip | |
media: v4l2-fwnode: suppress a warning at OF parsing logic
smatch produce this warning:
drivers/media/v4l2-core/v4l2-fwnode.c:76 v4l2_fwnode_endpoint_parse_csi_bus() error: buffer overflow 'array' 5 <= u16max
That's because, in thesis, the routine might have called with
some value at bus->num_data_lanes. That's not the current
case.
Yet, better to shut up this warning, and make the code more
reliable if some future changes might cause a bug.
While here, simplify the code a little bit by reading only
once from lanes-properties array.
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
| -rw-r--r-- | drivers/media/v4l2-core/v4l2-fwnode.c | 32 | ||||
| -rw-r--r-- | include/media/v4l2-fwnode.h | 6 |
2 files changed, 18 insertions, 20 deletions
diff --git a/drivers/media/v4l2-core/v4l2-fwnode.c b/drivers/media/v4l2-core/v4l2-fwnode.c index ca755a4832fc..d07c54efaa99 100644 --- a/drivers/media/v4l2-core/v4l2-fwnode.c +++ b/drivers/media/v4l2-core/v4l2-fwnode.c @@ -48,10 +48,9 @@ static int v4l2_fwnode_endpoint_parse_csi2_bus(struct fwnode_handle *fwnode, rval = fwnode_property_read_u32_array(fwnode, "data-lanes", NULL, 0); if (rval > 0) { - u32 array[ARRAY_SIZE(bus->data_lanes)]; + u32 array[MAX_DATA_LANES + 1]; - bus->num_data_lanes = - min_t(int, ARRAY_SIZE(bus->data_lanes), rval); + bus->num_data_lanes = min_t(int, MAX_DATA_LANES, rval); fwnode_property_read_u32_array(fwnode, "data-lanes", array, bus->num_data_lanes); @@ -64,24 +63,21 @@ static int v4l2_fwnode_endpoint_parse_csi2_bus(struct fwnode_handle *fwnode, bus->data_lanes[i] = array[i]; } - } - rval = fwnode_property_read_u32_array(fwnode, "lane-polarities", NULL, - 0); - if (rval > 0) { - u32 array[ARRAY_SIZE(bus->lane_polarities)]; + rval = fwnode_property_read_u32_array(fwnode, + "lane-polarities", array, + 1 + bus->num_data_lanes); + if (rval > 0) { + if (rval != 1 + bus->num_data_lanes /* clock + data */) { + pr_warn("invalid number of lane-polarities entries (need %u, got %u)\n", + 1 + bus->num_data_lanes, rval); + return -EINVAL; + } - if (rval < 1 + bus->num_data_lanes /* clock + data */) { - pr_warn("too few lane-polarities entries (need %u, got %u)\n", - 1 + bus->num_data_lanes, rval); - return -EINVAL; - } - fwnode_property_read_u32_array(fwnode, "lane-polarities", array, - 1 + bus->num_data_lanes); - - for (i = 0; i < 1 + bus->num_data_lanes; i++) - bus->lane_polarities[i] = array[i]; + for (i = 0; i < 1 + bus->num_data_lanes; i++) + bus->lane_polarities[i] = array[i]; + } } if (!fwnode_property_read_u32(fwnode, "clock-lanes", &v)) { diff --git a/include/media/v4l2-fwnode.h b/include/media/v4l2-fwnode.h index 29ae22bbbbaf..b373c43f65e8 100644 --- a/include/media/v4l2-fwnode.h +++ b/include/media/v4l2-fwnode.h @@ -26,6 +26,8 @@ struct fwnode_handle; +#define MAX_DATA_LANES 4 + /** * struct v4l2_fwnode_bus_mipi_csi2 - MIPI CSI-2 bus data structure * @flags: media bus (V4L2_MBUS_*) flags @@ -37,10 +39,10 @@ struct fwnode_handle; */ struct v4l2_fwnode_bus_mipi_csi2 { unsigned int flags; - unsigned char data_lanes[4]; + unsigned char data_lanes[MAX_DATA_LANES]; unsigned char clock_lane; unsigned short num_data_lanes; - bool lane_polarities[5]; + bool lane_polarities[MAX_DATA_LANES + 1]; }; /** |