Messages in this thread | | | Date | Mon, 06 May 2019 04:16:06 -0700 | Subject | KASAN: use-after-free Read in p54u_load_firmware_cb | From | syzbot <> |
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Hello,
syzbot found the following crash on:
HEAD commit: 43151d6c 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=142b312ca00000 kernel config: https://syzkaller.appspot.com/x/.config?x=4183eeef650d1234 dashboard link: https://syzkaller.appspot.com/bug?extid=200d4bb11b23d929335f compiler: gcc (GCC) 9.0.0 20181231 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+200d4bb11b23d929335f@syzkaller.appspotmail.com
usb 4-1: Direct firmware load for isl3887usb failed with error -2 usb 4-1: Firmware not found. ================================================================== BUG: KASAN: use-after-free in p54u_load_firmware_cb.cold+0x97/0x13a drivers/net/wireless/intersil/p54/p54usb.c:936 Read of size 8 at addr ffff888098bf3588 by task kworker/0:1/12
CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.1.0-rc3-319004-g43151d6 #6 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events request_firmware_work_func Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0xe8/0x16e lib/dump_stack.c:113 print_address_description+0x6c/0x236 mm/kasan/report.c:187 kasan_report.cold+0x1a/0x3c mm/kasan/report.c:317 p54u_load_firmware_cb.cold+0x97/0x13a drivers/net/wireless/intersil/p54/p54usb.c:936 request_firmware_work_func+0x12d/0x249 drivers/base/firmware_loader/main.c:785 process_one_work+0x90f/0x1580 kernel/workqueue.c:2269 worker_thread+0x9b/0xe20 kernel/workqueue.c:2415 kthread+0x313/0x420 kernel/kthread.c:253 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
The buggy address belongs to the page: page:ffffea000262fcc0 count:0 mapcount:0 mapping:0000000000000000 index:0x0 flags: 0xfff00000000000() raw: 00fff00000000000 0000000000000000 ffffffff02620101 0000000000000000 raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected
Memory state around the buggy address: ffff888098bf3480: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888098bf3500: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff > ffff888098bf3580: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff888098bf3600: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888098bf3680: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================
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