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quoted-printable Content-Type: text/plain; charset=UTF-8 Date: Fri, 21 Aug 2026 10:24:36 -0400 Message-Id: Subject: Re: [syzbot] [mm?] WARNING in ep_write_iter Cc: "syzbot" , , , , , , , , , , , , "Greg Kroah-Hartman" , To: "David Laight" , "Andrew Morton" From: "Zi Yan" X-Mailer: aerc 0.22.0 References: <6a820ebc.9ebadd4d.20b15e.001b.GAE@google.com> <20260816135201.98590b17b526dda8c4ec9105@linux-foundation.org> <20260821093039.04538795@pumpkin> In-Reply-To: <20260821093039.04538795@pumpkin> X-ClientProxiedBy: YQ1P288CA0007.CANP288.PROD.OUTLOOK.COM (2603:10b6:c01:9e::12) To IA0PR12MB8374.namprd12.prod.outlook.com (2603:10b6:208:40e::7) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: IA0PR12MB8374:EE_|CY5PR12MB6406:EE_ X-MS-Office365-Filtering-Correlation-Id: 0fa3f5e5-5bec-4f7c-2e64-08deff8feeab X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 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AM EDT, David Laight wrote: > On Sun, 16 Aug 2026 13:52:01 -0700 > Andrew Morton wrote: > >> On Sun, 16 Aug 2026 12:25:48 -0700 syzbot wrote: >>=20 >> > Hello, >> >=20 >> > syzbot found the following issue on: >> >=20 >> > HEAD commit: 3d6d817622b0 Merge tag 'scsi-fixes' of git://git.kerne= l.or.. >> > git tree: upstream >> > console output: https://syzkaller.appspot.com/x/log.txt?x=3D1592747958= 0000 >> > kernel config: https://syzkaller.appspot.com/x/.config?x=3Da59830cba9= 1a1981 >> > dashboard link: https://syzkaller.appspot.com/bug?extid=3D805630f1453e= 490427fa >> > compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6= e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 >> >=20 >> > Unfortunately, I don't have any reproducer for this issue yet. >> >=20 >> > Downloadable assets: >> > disk image (non-bootable): https://storage.googleapis.com/syzbot-asset= s/d900f083ada3/non_bootable_disk-3d6d8176.raw.xz >> > vmlinux: https://storage.googleapis.com/syzbot-assets/d19e0514c02a/vml= inux-3d6d8176.xz >> > kernel image: https://storage.googleapis.com/syzbot-assets/f6da706811f= 4/bzImage-3d6d8176.xz >> >=20 >> > IMPORTANT: if you fix the issue, please add the following tag to the c= ommit: >> > Reported-by: syzbot+805630f1453e490427fa@syzkaller.appspotmail.com >> >=20 >> > gadgetfs: bound to dummy_udc driver >> > ------------[ cut here ]------------ >> > 1 >> > WARNING: mm/page_alloc.c:5280 at __alloc_frozen_pages_noprof+0x2ce/0x3= 80 mm/page_alloc.c:5280, CPU#0: syz.0.0/5319 =20 >>=20 >> Thanks. drivers/usb/gadget is the offender. >>=20 >> Gemini sums it up well. "ep_write_iter() needs a bounds check prior to >> memory allocation". https://share.gemini.google/5NzjyttO0ULc >>=20 >> I expect an easy fix would be >>=20 >> --- a/drivers/usb/gadget/legacy/inode.c~a >> +++ a/drivers/usb/gadget/legacy/inode.c >> @@ -666,7 +666,7 @@ ep_write_iter(struct kiocb *iocb, struct >> return -EBADMSG; >> } >> =20 >> - buf =3D kmalloc(len, GFP_KERNEL); >> + buf =3D kmalloc(len, GFP_KERNEL|__GFP_NOWARN); >> if (unlikely(!buf)) { >> mutex_unlock(&epdata->lock); >> return -ENOMEM; >>=20 >> or do what Gemini said. Me, I'll add some cc's and run away. > > Should there be a separate flags for 'request too large' and > 'no memory available' ? What flags? Are you suggesting kmalloc should return an ERR_PTR to distinguish different error types? > > Although the errno for 'len too big' should probably be EINVAL > not ENOMEM. > > David > >>=20 >>=20 >> > Modules linked in: >> > CPU: 0 UID: 0 PID: 5319 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT= (full)=20 >> > Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian= -1.16.3-2 04/01/2014 >> > RIP: 0010:__alloc_frozen_pages_noprof+0x2ce/0x380 mm/page_alloc.c:5280 >> > Code: 74 10 4c 89 e7 89 54 24 0c e8 0e 2c 0e 00 8b 54 24 0c 49 83 3c 2= 4 00 0f 85 ab fe ff ff e9 ac fe ff ff c6 05 95 d2 18 0e 01 90 <0f> 0b 90 e9= 17 ff ff ff a9 00 00 08 00 48 8b 4c 24 10 4c 8d 44 24 >> > RSP: 0018:ffffc9000e13fa20 EFLAGS: 00010246 >> > RAX: ffffc9000e13fa00 RBX: 0000000000000013 RCX: 0000000000000000 >> > RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc9000e13fa88 >> > RBP: ffffc9000e13fb08 R08: ffffc9000e13fa87 R09: 0000000000000000 >> > R10: ffffc9000e13fa60 R11: fffff52001c27f51 R12: 0000000000000000 >> > R13: 1ffff92001c27f48 R14: 0000000000040cc0 R15: dffffc0000000000 >> > FS: 00007f6f4a58c6c0(0000) GS:ffff88808c549000(0000) knlGS:0000000000= 000000 >> > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >> > CR2: 00002000000010a0 CR3: 000000004323d000 CR4: 0000000000352ef0 >> > Call Trace: >> > >> > alloc_pages_mpol+0x212/0x380 mm/mempolicy.c:2490 >> > ___kmalloc_large_node+0x4c/0x120 mm/slub.c:5274 >> > __kmalloc_large_node_noprof+0x18/0x90 mm/slub.c:5305 >> > __do_kmalloc_node mm/slub.c:5322 [inline] >> > __kmalloc_noprof+0x405/0x720 mm/slub.c:5359 >> > _kmalloc_noprof include/linux/slab.h:992 [inline] >> > ep_write_iter+0x1bc/0x500 drivers/usb/gadget/legacy/inode.c:669 >> > new_sync_write fs/read_write.c:595 [inline] >> > vfs_write+0x612/0xba0 fs/read_write.c:687 >> > ksys_write+0x150/0x270 fs/read_write.c:739 >> > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] >> > do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 >> > entry_SYSCALL_64_after_hwframe+0x77/0x7f >> > RIP: 0033:0x7f6f4979e0d9 >> > Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 8= 9 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0= ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 >> > RSP: 002b:00007f6f4a58bfe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 >> > RAX: ffffffffffffffda RBX: 00007f6f49a25fa0 RCX: 00007f6f4979e0d9 >> > RDX: 00000000ffffffb9 RSI: 0000000000000000 RDI: 0000000000000004 >> > RBP: 00007f6f49835024 R08: 0000000000000000 R09: 0000000000000000 >> > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 >> > R13: 00007f6f49a26038 R14: 00007f6f49a25fa0 R15: 00007ffc6cf49328 >> > >> > =20 >>=20 >>=20 --=20 Best Regards, Yan, Zi