clk: bcm: rpi: Fix off by one in raspberrypi_discover_clocks()

[ Upstream commit da2edb3e3c09fd1451b7f400ccd1070ef086619a ]

Smatch detected an off by one in this code:
    drivers/clk/bcm/clk-raspberrypi.c:374 raspberrypi_discover_clocks()
    error: buffer overflow 'data->hws' 16 <= 16

The data->hws[] array has RPI_FIRMWARE_NUM_CLK_ID elements so the >
comparison needs to changed to >=.

Fixes: 12c90f3f27bb ("clk: bcm: rpi: Add variant structure")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Link: https://lore.kernel.org/r/5a850b08-d2f5-4794-aceb-a6b468965139@kili.mountain
Reviewed-by: Stefan Wahren <stefan.wahren@i2se.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/clk/bcm/clk-raspberrypi.c b/drivers/clk/bcm/clk-raspberrypi.c
index 679f464..278f845 100644 (file)
--- a/drivers/clk/bcm/clk-raspberrypi.c
+++ b/drivers/clk/bcm/clk-raspberrypi.c
@@ -375,9 +375,9 @@ static int raspberrypi_discover_clocks(struct raspberrypi_clk *rpi,
        while (clks->id) {
                struct raspberrypi_clk_variant *variant;
 
-               if (clks->id > RPI_FIRMWARE_NUM_CLK_ID) {
+               if (clks->id >= RPI_FIRMWARE_NUM_CLK_ID) {
                        dev_err(rpi->dev, "Unknown clock id: %u (max: %u)\n",
-                                          clks->id, RPI_FIRMWARE_NUM_CLK_ID);
+                                          clks->id, RPI_FIRMWARE_NUM_CLK_ID - 1);
                        return -EINVAL;
                }