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AM EDT, syzbot wrote: > syzbot has found a reproducer for the following issue on: > > HEAD commit: 8d3ae59288f1 Linux 7.2 > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=3D13bad94958000= 0 > kernel config: https://syzkaller.appspot.com/x/.config?x=3D1d67342c314f2= 28d > dashboard link: https://syzkaller.appspot.com/bug?extid=3D805630f1453e490= 427fa > compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for D= ebian) 2.44 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=3D1637ea2558000= 0 > > IMPORTANT: if you fix the issue, please add the following tag to the comm= it: > Reported-by: syzbot+805630f1453e490427fa@syzkaller.appspotmail.com > > gadgetfs: bound to dummy_udc driver > ------------[ cut here ]------------ > 1 > WARNING: mm/page_alloc.c:5280 at __alloc_frozen_pages_noprof+0x2427/0x2dc= 0 mm/page_alloc.c:5280, CPU#2: syz-executor421/6034 > Modules linked in: > CPU: 2 UID: 0 PID: 6034 Comm: syz-executor421 Not tainted syzkaller #0 PR= EEMPT(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+0x2427/0x2dc0 mm/page_alloc.c:5280 > Code: e9 8d fb ff ff 31 d2 be 28 12 00 00 48 c7 c7 a0 74 01 8c e8 7b 95 6= 8 ff 2e 2e 2e 31 c0 e9 02 ed ff ff c6 05 85 90 bc 0e 01 90 <0f> 0b 90 e9 6f= df ff ff 48 c7 c7 80 be f3 8e 45 89 f7 44 8b 74 24 > RSP: 0018:ffffc900048c7810 EFLAGS: 00010246 > RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 > RDX: 0000000000000000 RSI: 1ffff92000918f1c RDI: 0000000000040cc0 > RBP: 0000000000000013 R08: 0000000000000005 R09: 0000000000000009 > R10: 0000000000000013 R11: 0000000000000000 R12: 0000000000040cc0 > R13: 1ffff92000918f5a R14: ffffffff9b95c444 R15: 0000000000000001 > FS: 00005555738a6400(0000) GS:ffff8880d5dde000(0000) knlGS:0000000000000= 000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007ffd5f5d6fe8 CR3: 0000000020943000 CR4: 0000000000352ef0 > Call Trace: > > alloc_pages_mpol+0x1fb/0x540 mm/mempolicy.c:2490 > ___kmalloc_large_node+0xe5/0x120 mm/slub.c:5274 > __kmalloc_large_node_noprof+0x1c/0x70 mm/slub.c:5305 > __do_kmalloc_node mm/slub.c:5322 [inline] > __kmalloc_noprof+0x5a1/0x820 mm/slub.c:5359 > _kmalloc_noprof include/linux/slab.h:992 [inline] > ep_write_iter+0x180/0xbc0 drivers/usb/gadget/legacy/inode.c:669 > new_sync_write fs/read_write.c:595 [inline] > vfs_write+0x6ac/0x1050 fs/read_write.c:687 > ksys_write+0x12a/0x250 fs/read_write.c:739 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7f7cc18b5cb7 > Code: 48 89 fa 4c 89 df e8 98 1d 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 f= c 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80= 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff > RSP: 002b:00007ffd5f5d76e0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001 > RAX: ffffffffffffffda RBX: 00005555738a6400 RCX: 00007f7cc18b5cb7 > RDX: 000000007fffffff RSI: 0000000000000000 RDI: 0000000000000004 > RBP: 00007ffd5f5d7730 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffd5f5d7930 > R13: 00007f7cc18ea039 R14: 00007ffd5f5d7b30 R15: 0000000000000002 > > > > --- > If you want syzbot to run the reproducer, reply with: > #syz test: git://repo/address.git branch-or-commit-hash > If you attach or paste a git patch, syzbot will apply it before testing. #syz test diff --git a/mm/slub.c b/mm/slub.c index 0337e60db5ace..2d87896c6dfbf 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -5265,6 +5265,9 @@ static void *___kmalloc_large_node(size_t size, gfp_t= flags, int node) void *ptr =3D NULL; unsigned int order =3D get_order(size); =20 + if (size > KMALLOC_MAX_SIZE) + return NULL; + if (unlikely(flags & GFP_SLAB_BUG_MASK)) flags =3D kmalloc_fix_flags(flags); =20 --=20 Best Regards, Yan, Zi