[PATCH v3] pinctrl: thunderbay: fix possible memory leak in thunderbay_build_functions()

[Gaosheng Cui <cuigaosheng1@xxxxxxxxxx>]

The thunderbay_add_functions() will free memory of thunderbay_funcs
when everything is ok, but thunderbay_funcs will not be freed when
thunderbay_add_functions() fails, then there will be a memory leak,
so we need to add kfree() when thunderbay_add_functions() fails to
fix it.

In addition, doing some cleaner works, moving kfree(funcs) from
thunderbay_add_functions() to thunderbay_build_functions().

Fixes: 12422af8194d ("pinctrl: Add Intel Thunder Bay pinctrl driver")
Signed-off-by: Gaosheng Cui <cuigaosheng1@xxxxxxxxxx>
---
v3:
- Doing some cleaner works, moving kfree(funcs) from thunderbay_add_functions()
  to thunderbay_build_functions(), and update the commit message, thanks!
v2:
- Free the memory in thunderbay_build_functions, and update the commit
  message and the fixes tag, thanks!
 drivers/pinctrl/pinctrl-thunderbay.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/pinctrl/pinctrl-thunderbay.c b/drivers/pinctrl/pinctrl-thunderbay.c
index 9328b17485cf..590bbbf619af 100644
--- a/drivers/pinctrl/pinctrl-thunderbay.c
+++ b/drivers/pinctrl/pinctrl-thunderbay.c
@@ -808,7 +808,7 @@ static int thunderbay_add_functions(struct thunderbay_pinctrl *tpc, struct funct
 					    funcs[i].num_group_names,
 					    funcs[i].data);
 	}
-	kfree(funcs);
+
 	return 0;
 }
 
@@ -817,6 +817,7 @@ static int thunderbay_build_functions(struct thunderbay_pinctrl *tpc)
 	struct function_desc *thunderbay_funcs;
 	void *ptr;
 	int pin;
+	int ret;
 
 	/*
 	 * Allocate maximum possible number of functions. Assume every pin
@@ -860,7 +861,10 @@ static int thunderbay_build_functions(struct thunderbay_pinctrl *tpc)
 		return -ENOMEM;
 
 	thunderbay_funcs = ptr;
-	return thunderbay_add_functions(tpc, thunderbay_funcs);
+	ret = thunderbay_add_functions(tpc, thunderbay_funcs);
+
+	kfree(thunderbay_funcs);
+	return ret;
 }
 
 static int thunderbay_pinconf_set_tristate(struct thunderbay_pinctrl *tpc,
-- 
2.25.1