linux-kernel - Re: [syzbot] [net?] general protection fault in ip6_pol

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Message-ID: <20250205113426.1976-1-hdanton@sina.com>
Date: Wed,  5 Feb 2025 19:34:25 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+3201be560ebfa39bc6bd@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [net?] general protection fault in ip6_pol_route (3)

On Tue, 04 Feb 2025 06:07:34 -0800
> syzbot found the following issue on:
> 
> HEAD commit:    f1b785f4c787 Merge tag 'for_linus' of git://git.kernel.org..
> git tree:       upstream
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1209e4c0580000

#syz test  upstream  master

--- x/net/ipv6/route.c
+++ y/net/ipv6/route.c
@@ -2258,7 +2258,7 @@ struct rt6_info *ip6_pol_route(struct ne
 
 			return rt;
 		}
-	} else {
+	} else if (res.nh) {
 		/* Get a percpu copy */
 		local_bh_disable();
 		rt = rt6_get_pcpu_route(&res);
--