misc: vexpress: Off by one in vexpress_syscfg_exec()

commit f8a70d8b889f180e6860cb1f85fed43d37844c5a upstream.

The > comparison should be >= to prevent reading beyond the end of the
func->template[] array.

(The func->template array is allocated in vexpress_syscfg_regmap_init()
and it has func->num_templates elements.)

Fixes: 974cc7b93441 ("mfd: vexpress: Define the device as MFD cells")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/misc/vexpress-syscfg.c b/drivers/misc/vexpress-syscfg.c
index c344483..9f257c5 100644 (file)
--- a/drivers/misc/vexpress-syscfg.c
+++ b/drivers/misc/vexpress-syscfg.c
@@ -61,7 +61,7 @@ static int vexpress_syscfg_exec(struct vexpress_syscfg_func *func,
        int tries;
        long timeout;
 
-       if (WARN_ON(index > func->num_templates))
+       if (WARN_ON(index >= func->num_templates))
                return -EINVAL;
 
        command = readl(syscfg->base + SYS_CFGCTRL);