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

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Message-ID: <20250205105414.1916-1-hdanton@sina.com>
Date: Wed,  5 Feb 2025 18:54:13 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+86a8ab09a0f655f1ff19@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [net?] general protection fault in generic_hwtstamp_ioctl_lower (2)

On Tue, 04 Feb 2025 07:22:16 -0800
> syzbot found the following issue on:
> 
> HEAD commit:    69e858e0b8b2 Merge tag 'uml-for-linus-6.14-rc1' of git://g..
> git tree:       upstream
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=161595f8580000

#syz test upstream  master

--- x/net/core/dev_ioctl.c
+++ y/net/core/dev_ioctl.c
@@ -452,6 +452,8 @@ static int generic_hwtstamp_ioctl_lower(
 	struct ifreq ifrr;
 	int err;
 
+	if (!kernel_cfg->ifr)
+		return -ENODEV;
 	strscpy_pad(ifrr.ifr_name, dev->name, IFNAMSIZ);
 	ifrr.ifr_ifru = kernel_cfg->ifr->ifr_ifru;
 
--