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| /openbmc/linux/net/bluetooth/ |
| H A D | smp.c | 0a66cf20 Mon Mar 24 07:39:03 CDT 2014 Johan Hedberg <johan.hedberg@intel.com> Bluetooth: Fix potential NULL pointer dereference in SMP
If a sudden disconnection happens the l2cap_conn pointer may already
have been cleaned up by the time hci_conn_security gets called,
resulting in the following oops if we don't have a proper NULL check:
BUG: unable to handle kernel NULL pointer dereference at 000000c8
IP: [<c132e2ed>] smp_conn_security+0x26/0x151
*pde = 00000000
Oops: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
CPU: 1 PID: 673 Comm: memcheck-x86-li Not tainted 3.14.0-rc2+ #437
Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
task: f0ef0520 ti: f0d6a000 task.ti: f0d6a000
EIP: 0060:[<c132e2ed>] EFLAGS: 00010246 CPU: 1
EIP is at smp_conn_security+0x26/0x151
EAX: f0ec1770 EBX: f0ec1770 ECX: 00000002 EDX: 00000002
ESI: 00000002 EDI: 00000000 EBP: f0d6bdc0 ESP: f0d6bda0
DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
CR0: 80050033 CR2: 000000c8 CR3: 30f0f000 CR4: 00000690
Stack:
f4f55000 00000002 f0d6bdcc c1097a2b c1319f40 f0ec1770 00000002 f0d6bdd0
f0d6bde8 c1312a82 f0d6bdfc c1312a82 c1319f84 00000008 f4d81c20 f0e5fd86
f0ec1770 f0d6bdfc f0d6be28 c131be3b c131bdc1 f0d25270 c131be3b 00000008
Call Trace:
[<c1097a2b>] ? __kmalloc+0x118/0x128
[<c1319f40>] ? mgmt_pending_add+0x49/0x9b
[<c1312a82>] hci_conn_security+0x4a/0x1dd
[<c1312a82>] ? hci_conn_security+0x4a/0x1dd
[<c1319f84>] ? mgmt_pending_add+0x8d/0x9b
[<c131be3b>] pair_device+0x1e1/0x206
[<c131bdc1>] ? pair_device+0x167/0x206
[<c131be3b>] ? pair_device+0x1e1/0x206
[<c131ed44>] mgmt_control+0x275/0x2d6
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
0a66cf20 Mon Mar 24 07:39:03 CDT 2014 Johan Hedberg <johan.hedberg@intel.com> Bluetooth: Fix potential NULL pointer dereference in SMP
If a sudden disconnection happens the l2cap_conn pointer may already
have been cleaned up by the time hci_conn_security gets called,
resulting in the following oops if we don't have a proper NULL check:
BUG: unable to handle kernel NULL pointer dereference at 000000c8
IP: [<c132e2ed>] smp_conn_security+0x26/0x151
*pde = 00000000
Oops: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
CPU: 1 PID: 673 Comm: memcheck-x86-li Not tainted 3.14.0-rc2+ #437
Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
task: f0ef0520 ti: f0d6a000 task.ti: f0d6a000
EIP: 0060:[<c132e2ed>] EFLAGS: 00010246 CPU: 1
EIP is at smp_conn_security+0x26/0x151
EAX: f0ec1770 EBX: f0ec1770 ECX: 00000002 EDX: 00000002
ESI: 00000002 EDI: 00000000 EBP: f0d6bdc0 ESP: f0d6bda0
DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
CR0: 80050033 CR2: 000000c8 CR3: 30f0f000 CR4: 00000690
Stack:
f4f55000 00000002 f0d6bdcc c1097a2b c1319f40 f0ec1770 00000002 f0d6bdd0
f0d6bde8 c1312a82 f0d6bdfc c1312a82 c1319f84 00000008 f4d81c20 f0e5fd86
f0ec1770 f0d6bdfc f0d6be28 c131be3b c131bdc1 f0d25270 c131be3b 00000008
Call Trace:
[<c1097a2b>] ? __kmalloc+0x118/0x128
[<c1319f40>] ? mgmt_pending_add+0x49/0x9b
[<c1312a82>] hci_conn_security+0x4a/0x1dd
[<c1312a82>] ? hci_conn_security+0x4a/0x1dd
[<c1319f84>] ? mgmt_pending_add+0x8d/0x9b
[<c131be3b>] pair_device+0x1e1/0x206
[<c131bdc1>] ? pair_device+0x167/0x206
[<c131be3b>] ? pair_device+0x1e1/0x206
[<c131ed44>] mgmt_control+0x275/0x2d6
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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