linux-kernel - [PATCH] HID: hidraw: fix a problem of memory leak in hidraw

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Message-Id: <20240125063225.2796234-1-suhui@nfschina.com>
Date: Thu, 25 Jan 2024 14:32:26 +0800
From: Su Hui <suhui@...china.com>
To: jikos@...nel.org,
	benjamin.tissoires@...hat.com
Cc: Su Hui <suhui@...china.com>,
	mail@...thek.com,
	linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [PATCH] HID: hidraw: fix a problem of memory leak in hidraw_release()

'struct hidraw_list' is a circular queue whose head can be smaller than
tail. Using 'list->tail != list->head' to release all memory that should
be released.

Fixes: a5623a203cff ("HID: hidraw: fix memory leak in hidraw_release()")
Signed-off-by: Su Hui <suhui@...china.com>
---
 drivers/hid/hidraw.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/hid/hidraw.c b/drivers/hid/hidraw.c
index 13c8dd8cd350..2bc762d31ac7 100644
--- a/drivers/hid/hidraw.c
+++ b/drivers/hid/hidraw.c
@@ -357,8 +357,11 @@ static int hidraw_release(struct inode * inode, struct file * file)
 	down_write(&minors_rwsem);
 
 	spin_lock_irqsave(&hidraw_table[minor]->list_lock, flags);
-	for (int i = list->tail; i < list->head; i++)
-		kfree(list->buffer[i].value);
+	while (list->tail != list->head) {
+		kfree(list->buffer[list->tail].value);
+		list->buffer[list->tail].value = NULL;
+		list->tail = (list->tail + 1) & (HIDRAW_BUFFER_SIZE - 1);
+	}
 	list_del(&list->node);
 	spin_unlock_irqrestore(&hidraw_table[minor]->list_lock, flags);
 	kfree(list);
-- 
2.30.2