[PATCH] pinctrl: core: fix pin name leak on radix_tree_insert() error path

[Haotian Zhang <vulab@iscas.ac.cn>]

pinctrl_register_one_pin() allocates pindesc->name with kasprintf() when
the pin has no static name, and marks it with pindesc->dynamic_name.  If
the subsequent radix_tree_insert() fails, the function jumps to the
failed label, which only calls kfree(pindesc) and never frees the
dynamically allocated name, leaking it.

Since the insertion failed, the pin is not in the radix tree, so the
caller's pinctrl_free_pindescs() cleanup cannot find it and cannot
release the name either.

Release pindesc->name on the failed path when it was dynamically
allocated.

Fixes: ecfe9a015d3e ("pinctrl: core: handle radix_tree_insert() errors in pinctrl_register_one_pin()")
Assisted-by: DeepSeek-V4.1-Flash
Signed-off-by: Haotian Zhang <vulab@iscas.ac.cn>
---
 drivers/pinctrl/core.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c
index 1675dd36bd5c..3a1d1ff871ef 100644
--- a/drivers/pinctrl/core.c
+++ b/drivers/pinctrl/core.c
@@ -249,6 +249,8 @@ static int pinctrl_register_one_pin(struct pinctrl_dev *pctldev,
 	return 0;
 
 failed:
+	if (pindesc->dynamic_name)
+		kfree(pindesc->name);
 	kfree(pindesc);
 	return error;
 }
-- 
2.25.1