On Mon, Aug 12, 2019 at 02:22:52PM +0200, Andrey Konovalov wrote: > On Mon, Aug 12, 2019 at 2:18 PM syzbot > <syzbot+ba00d6a2a24df57a94ca@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > > > Hello, > > > > syzbot found the following crash on: > > > > HEAD commit: e96407b4 usb-fuzzer: main usb gadget fuzzer driver > > git tree: https://github.com/google/kasan.git usb-fuzzer > > console output: https://syzkaller.appspot.com/x/log.txt?x=162aac02600000 > > kernel config: https://syzkaller.appspot.com/x/.config?x=cfa2c18fb6a8068e > > dashboard link: https://syzkaller.appspot.com/bug?extid=ba00d6a2a24df57a94ca > > compiler: gcc (GCC) 9.0.0 20181231 (experimental) > > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1123edc2600000 > > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16079d2c600000 > > > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > > Reported-by: syzbot+ba00d6a2a24df57a94ca@xxxxxxxxxxxxxxxxxxxxxxxxx > > > > ldusb 1-1:0.28: Read buffer overflow, -131386046930688 bytes dropped > > ================================================================== > > BUG: KASAN: slab-out-of-bounds in _copy_to_user+0x124/0x150 > > lib/usercopy.c:27 > > Read of size 2147479552 at addr ffff8881cd580008 by task > > syz-executor268/1890 > > > > CPU: 0 PID: 1890 Comm: syz-executor268 Not tainted 5.3.0-rc2+ #25 > > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > > Google 01/01/2011 > > Call Trace: > > __dump_stack lib/dump_stack.c:77 [inline] > > dump_stack+0xca/0x13e lib/dump_stack.c:113 > > print_address_description+0x6a/0x32c mm/kasan/report.c:351 > > __kasan_report.cold+0x1a/0x33 mm/kasan/report.c:482 > > kasan_report+0xe/0x12 mm/kasan/common.c:612 > > check_memory_region_inline mm/kasan/generic.c:185 [inline] > > check_memory_region+0x128/0x190 mm/kasan/generic.c:192 > > _copy_to_user+0x124/0x150 lib/usercopy.c:27 > > copy_to_user include/linux/uaccess.h:152 [inline] > > ld_usb_read+0x31a/0x780 drivers/usb/misc/ldusb.c:495 > > #syz dup: KASAN: use-after-free Read in ld_usb_release #syz dup: KASAN: slab-out-of-bounds Read in ld_usb_read (3)
