[PATCH v2] soc: mediatek: svs: Fix memory leak in svs_enable_debug_write()

[Zilin Guan]

In svs_enable_debug_write(), the buf allocated by memdup_user_nul()
is leaked if kstrtoint() fails.

Fix this by using __free(kfree) to automatically free buf, eliminating
the need for explicit kfree() calls and preventing leaks.

Fixes: 13f1bbcfb582 ("soc: mediatek: SVS: add debug commands")
Co-developed-by: Jianhao Xu <jianhao.xu at seu.edu.cn>
Signed-off-by: Jianhao Xu <jianhao.xu at seu.edu.cn>
Signed-off-by: Zilin Guan <zilin at seu.edu.cn>
---
Changes in v2:
- Use __free(kfree) to simplify memory management.
---
 drivers/soc/mediatek/mtk-svs.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/soc/mediatek/mtk-svs.c b/drivers/soc/mediatek/mtk-svs.c
index f45537546553..5ede59299613 100644
--- a/drivers/soc/mediatek/mtk-svs.c
+++ b/drivers/soc/mediatek/mtk-svs.c
@@ -789,7 +789,7 @@ static ssize_t svs_enable_debug_write(struct file *filp,
 	struct svs_bank *svsb = file_inode(filp)->i_private;
 	struct svs_platform *svsp = dev_get_drvdata(svsb->dev);
 	int enabled, ret;
-	char *buf = NULL;
+	char *buf __free(kfree) = NULL;
 
 	if (count >= PAGE_SIZE)
 		return -EINVAL;
@@ -807,8 +807,6 @@ static ssize_t svs_enable_debug_write(struct file *filp,
 		svsb->mode_support = SVSB_MODE_ALL_DISABLE;
 	}
 
-	kfree(buf);
-
 	return count;
 }
 
-- 
2.34.1