linux-kernel - Re: [syzbot] [net?] general protection fault in put

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Message-ID: <20241218114106.255-1-hdanton@sina.com>
Date: Wed, 18 Dec 2024 19:41:02 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+38a095a81f30d82884c1@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [net?] general protection fault in put_page (4)

On Tue, Dec 17, 2024 at 6:03 PM
> syzbot found the following issue on:
>
> HEAD commit:    78d4f34e2115 Linux 6.13-rc3
> git tree:       upstream
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13f502df980000

#syz test

--- x/net/core/skbuff.c
+++ y/net/core/skbuff.c
@@ -1105,7 +1105,9 @@ static void skb_release_data(struct sk_b
 	int i;
 
 	if (!skb_data_unref(skb, shinfo))
-		goto exit;
+		return;
+	if (test_and_set_bit(7, &shinfo->flags))
+		return;
 
 	if (skb_zcopy(skb)) {
 		bool skip_unref = shinfo->flags & SKBFL_MANAGED_FRAG_REFS;
--