• Matias Karhumaa's avatar
    Bluetooth: Fix debugfs NULL pointer dereference · 30d65e08
    Matias Karhumaa authored
    Fix crash caused by NULL pointer dereference when debugfs functions
    le_max_key_read, le_max_key_size_write, le_min_key_size_read or
    le_min_key_size_write and Bluetooth adapter was powered off.
    
    Fix is to move max_key_size and min_key_size from smp_dev to hci_dev.
    At the same time they were renamed to le_max_key_size and
    le_min_key_size.
    
    BUG: unable to handle kernel NULL pointer dereference at 00000000000002e8
    PGD 0 P4D 0
    Oops: 0000 [#24] SMP PTI
    CPU: 2 PID: 6255 Comm: cat Tainted: G      D    OE     4.18.9-200.fc28.x86_64 #1
    Hardware name: LENOVO 4286CTO/4286CTO, BIOS 8DET76WW (1.46 ) 06/21/2018
    RIP: 0010:le_max_key_size_read+0x45/0xb0 [bluetooth]
    Code: 00 00 00 48 83 ec 10 65 48 8b 04 25 28 00 00 00 48 89 44 24 08 31 c0 48 8b 87 c8 00 00 00 48 8d 7c 24 04 48 8b 80 48 0a 00 00 <48> 8b 80 e8 02 00 00 0f b6 48 52 e8 fb b6 b3 ed be 04 00 00 00 48
    RSP: 0018:ffffab23c3ff3df0 EFLAGS: 00010246
    RAX: 0000000000000000 RBX: 00007f0b4ca2e000 RCX: ffffab23c3ff3f08
    RDX: ffffffffc0ddb033 RSI: 0000000000000004 RDI: ffffab23c3ff3df4
    RBP: 0000000000020000 R08: 0000000000000000 R09: 0000000000000000
    R10: ffffab23c3ff3ed8 R11: 0000000000000000 R12: ffffab23c3ff3f08
    R13: 00007f0b4ca2e000 R14: 0000000000020000 R15: ffffab23c3ff3f08
    FS:  00007f0b4ca0f540(0000) GS:ffff91bd5e280000(0000) knlGS:0000000000000000
    CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    CR2: 00000000000002e8 CR3: 00000000629fa006 CR4: 00000000000606e0
    Call Trace:
     full_proxy_read+0x53/0x80
     __vfs_read+0x36/0x180
     vfs_read+0x8a/0x140
     ksys_read+0x4f/0xb0
     do_syscall_64+0x5b/0x160
     entry_SYSCALL_64_after_hwframe+0x44/0xa9
    Signed-off-by: default avatarMatias Karhumaa <matias.karhumaa@gmail.com>
    Signed-off-by: default avatarMarcel Holtmann <marcel@holtmann.org>
    30d65e08
hci_core.c 105 KB