wifi: mwifiex: fix memory leak in mwifiex_histogram_read()

Always free the zeroed page on return from 'mwifiex_histogram_read()'.

Fixes: cbf6e05527a7 ("mwifiex: add rx histogram statistics support")

Acked-by: Brian Norris <briannorris@chromium.org>
Signed-off-by: Dmitry Antipov <dmantipov@yandex.ru>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20230802160726.85545-1-dmantipov@yandex.ru

diff --git a/drivers/net/wireless/marvell/mwifiex/debugfs.c b/drivers/net/wireless/marvell/mwifiex/debugfs.c
index 52b18f4..0cdd6c5 100644 (file)
--- a/drivers/net/wireless/marvell/mwifiex/debugfs.c
+++ b/drivers/net/wireless/marvell/mwifiex/debugfs.c
@@ -253,8 +253,11 @@ mwifiex_histogram_read(struct file *file, char __user *ubuf,
        if (!p)
                return -ENOMEM;
 
-       if (!priv || !priv->hist_data)
-               return -EFAULT;
+       if (!priv || !priv->hist_data) {
+               ret = -EFAULT;
+               goto free_and_exit;
+       }
+
        phist_data = priv->hist_data;
 
        p += sprintf(p, "\n"
@@ -309,6 +312,8 @@ mwifiex_histogram_read(struct file *file, char __user *ubuf,
        ret = simple_read_from_buffer(ubuf, count, ppos, (char *)page,
                                      (unsigned long)p - page);
 
+free_and_exit:
+       free_page(page);
        return ret;
 }