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authorTony Lindgren <tony@atomide.com>2012-01-25 04:28:08 +0400
committerLinus Walleij <linus.walleij@linaro.org>2012-01-26 17:13:11 +0400
commitb9130b776ee481acbc27a7e56d98df75680de369 (patch)
treeb7933b4d3e562e806c3dc61544352e46f35820cb /drivers/pinctrl/pinmux.c
parent9e2551e10b5c7ba550849bd9ed519e498cc30e68 (diff)
downloadlinux-b9130b776ee481acbc27a7e56d98df75680de369.tar.xz
pinctrl: add checks for empty function names
This is needed as otherwise we can get the following when dealing with buggy data in a pinmux driver for pinmux_search_function: Unable to handle kernel NULL pointer dereference at virtual address 00000000 ... PC is at strcmp+0xc/0x34 LR is at pinmux_get+0x350/0x8f4 ... As we need pctldev initialized to call ops->list_functions, let's initialize it before check_ops calls and pass the pctldev to the check_ops functions. Do this for both pinmux and pinconf check_ops functions. Signed-off-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/pinctrl/pinmux.c')
-rw-r--r--drivers/pinctrl/pinmux.c17
1 files changed, 16 insertions, 1 deletions
diff --git a/drivers/pinctrl/pinmux.c b/drivers/pinctrl/pinmux.c
index 3ffa9324ed82..7c3193f7a044 100644
--- a/drivers/pinctrl/pinmux.c
+++ b/drivers/pinctrl/pinmux.c
@@ -889,8 +889,11 @@ void pinmux_disable(struct pinmux *pmx)
}
EXPORT_SYMBOL_GPL(pinmux_disable);
-int pinmux_check_ops(const struct pinmux_ops *ops)
+int pinmux_check_ops(struct pinctrl_dev *pctldev)
{
+ const struct pinmux_ops *ops = pctldev->desc->pmxops;
+ unsigned selector = 0;
+
/* Check that we implement required operations */
if (!ops->list_functions ||
!ops->get_function_name ||
@@ -899,6 +902,18 @@ int pinmux_check_ops(const struct pinmux_ops *ops)
!ops->disable)
return -EINVAL;
+ /* Check that all functions registered have names */
+ while (ops->list_functions(pctldev, selector) >= 0) {
+ const char *fname = ops->get_function_name(pctldev,
+ selector);
+ if (!fname) {
+ pr_err("pinmux ops has no name for function%u\n",
+ selector);
+ return -EINVAL;
+ }
+ selector++;
+ }
+
return 0;
}