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PM EDT, Andrew Morton wrote: > On Sun, 16 Aug 2026 12:25:48 -0700 syzbot wrote: > >> Hello, >>=20 >> syzbot found the following issue on: >>=20 >> HEAD commit: 3d6d817622b0 Merge tag 'scsi-fixes' of git://git.kernel.= or.. >> git tree: upstream >> console output: https://syzkaller.appspot.com/x/log.txt?x=3D159274795800= 00 >> kernel config: https://syzkaller.appspot.com/x/.config?x=3Da59830cba91a= 1981 >> dashboard link: https://syzkaller.appspot.com/bug?extid=3D805630f1453e49= 0427fa >> compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e2= 55-1~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-assets/= d900f083ada3/non_bootable_disk-3d6d8176.raw.xz >> vmlinux: https://storage.googleapis.com/syzbot-assets/d19e0514c02a/vmlin= ux-3d6d8176.xz >> kernel image: https://storage.googleapis.com/syzbot-assets/f6da706811f4/= bzImage-3d6d8176.xz >>=20 >> IMPORTANT: if you fix the issue, please add the following tag to the com= mit: >> 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/0x380= mm/page_alloc.c:5280, CPU#0: syz.0.0/5319 > > Thanks. drivers/usb/gadget is the offender. > > Gemini sums it up well. "ep_write_iter() needs a bounds check prior to > memory allocation". https://share.gemini.google/5NzjyttO0ULc > > I expect an easy fix would be Maybe it is better to stop asking kmalloc for unreasonable len: diff --git a/drivers/usb/gadget/legacy/inode.c b/drivers/usb/gadget/legacy/= inode.c index d87a8ab515107..20905f254968f 100644 --- a/drivers/usb/gadget/legacy/inode.c +++ b/drivers/usb/gadget/legacy/inode.c @@ -645,6 +645,9 @@ ep_write_iter(struct kiocb *iocb, struct iov_iter *from= ) ssize_t value; char *buf; =20 + if (len > KMALLOC_MAX_SIZE) + return -EINVAL; + if ((value =3D get_ready_ep(file->f_flags, epdata, true)) < 0) return value; > > --- 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; > > or do what Gemini said. Me, I'll add some cc's and run away. > > >> Modules linked in: >> CPU: 0 UID: 0 PID: 5319 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(f= ull)=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 24 = 00 0f 85 ab fe ff ff e9 ac fe ff ff c6 05 95 d2 18 0e 01 90 <0f> 0b 90 e9 1= 7 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:000000000000= 0000 >> 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 89 = f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 f= f 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 Best Regards, Yan, Zi