[PATCH 3/4] pinctrl: Add checks for empty names inpinmux_search_function

[Tony Lindgren]

Otherwise we can get the following when dealing with
buggy data in a pinmux driver:

Unable to handle kernel NULL pointer dereference at virtual address 00000000
...
PC is at strcmp+0xc/0x34
LR is at pinmux_get+0x350/0x8f4
...

Signed-off-by: Tony Lindgren <tony@xxxxxxxxxxx>
---
 drivers/pinctrl/pinmux.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/drivers/pinctrl/pinmux.c b/drivers/pinctrl/pinmux.c
index 06b8943..ffe633d 100644
--- a/drivers/pinctrl/pinmux.c
+++ b/drivers/pinctrl/pinmux.c
@@ -584,6 +584,13 @@ static int pinmux_search_function(struct pinctrl_dev *pctldev,
 							   selector);
 		int ret;
 
+		if (!fname) {
+			pr_warning("no name for function%i\n",
+				   selector);
+			selector++;
+			continue;
+		}
+
 		if (!strcmp(map->function, fname)) {
 			/* Found the function, check pin group */
 			ret = pinmux_check_pin_group(pctldev, selector,

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