pinctrl: thunderbay: fix possible memory leak in thunderbay_build_functions()

[ Upstream commit 83e1bcaf8cef26edaaf2a6098ef760f563683483 ]

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@huawei.com>
Reviewed-by: Rafał Miłecki <rafal@milecki.pl>
Link: https://lore.kernel.org/r/20221129120126.1567338-1-cuigaosheng1@huawei.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/pinctrl/pinctrl-thunderbay.c b/drivers/pinctrl/pinctrl-thunderbay.c
index 9328b17..590bbbf 100644 (file)
--- 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,