Hi! I've got the following error report while running the syzkaller fuzzer. The length passed to memdup_user() directly without limitations. On commit 2caceb3294a78c389b462e7e236a4e744a53a474 (Dec 1). WARNING: CPU: 3 PID: 14477 at mm/page_alloc.c:3511 __alloc_pages_nodemask+0x159c/0x1e20 Kernel panic - not syncing: panic_on_warn set ... CPU: 3 PID: 14477 Comm: syz-executor0 Not tainted 4.9.0-rc7+ #61 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 ffff880039b67298 ffffffff81f96bba ffffffff00000200 1ffff1000736cde6 ffffed000736cdde 0000000000000a06 0000000041b58ab3 ffffffff8598af00 ffffffff81f96928 0000000041b58ab3 ffffffff859423c8 ffffffff81432790 Call Trace: [< inline >] __dump_stack lib/dump_stack.c:15 [<ffffffff81f96bba>] dump_stack+0x292/0x398 lib/dump_stack.c:51 [<ffffffff8168c7ae>] panic+0x1cb/0x3a9 kernel/panic.c:179 [<ffffffff812b80b4>] __warn+0x1c4/0x1e0 kernel/panic.c:542 [<ffffffff812b831c>] warn_slowpath_null+0x2c/0x40 kernel/panic.c:585 [< inline >] __alloc_pages_slowpath mm/page_alloc.c:3511 [<ffffffff816c07cc>] __alloc_pages_nodemask+0x159c/0x1e20 mm/page_alloc.c:3781 [<ffffffff817cdd27>] alloc_pages_current+0x1c7/0x6b0 mm/mempolicy.c:2072 [< inline >] alloc_pages include/linux/gfp.h:469 [<ffffffff8172fcdf>] kmalloc_order+0x1f/0x70 mm/slab_common.c:1015 [<ffffffff8172fd4f>] kmalloc_order_trace+0x1f/0x160 mm/slab_common.c:1026 [< inline >] kmalloc_large include/linux/slab.h:422 [<ffffffff817e348f>] __kmalloc_track_caller+0x1df/0x290 mm/slub.c:4233 [<ffffffff8171bb3c>] memdup_user+0x2c/0xa0 mm/util.c:137 [<ffffffff83228ca2>] dev_config+0x2e2/0x1180 drivers/usb/gadget/legacy/inode.c:1776 [<ffffffff817fde55>] __vfs_write+0x5d5/0x760 fs/read_write.c:510 [<ffffffff817ff750>] vfs_write+0x170/0x4e0 fs/read_write.c:560 [< inline >] SYSC_write fs/read_write.c:607 [<ffffffff81803b5b>] SyS_write+0xfb/0x230 fs/read_write.c:599 [<ffffffff84f44cc1>] entry_SYSCALL_64_fastpath+0x1f/0xc2 Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
