diff options
| author | Thomas Gleixner <[email protected]> | 2016-03-18 07:35:29 +0000 |
|---|---|---|
| committer | Thomas Gleixner <[email protected]> | 2016-03-18 13:51:06 +0000 |
| commit | f508a5ba7a4570418df6cfd68fe663ffdef2be63 (patch) | |
| tree | 2434d09f8cfadd8022470464529dae59483a214a /net/switchdev/switchdev.c | |
| parent | x86/apic: Fix suspicious RCU usage in smp_trace_call_function_interrupt() (diff) | |
| download | kernel-f508a5ba7a4570418df6cfd68fe663ffdef2be63.tar.gz kernel-f508a5ba7a4570418df6cfd68fe663ffdef2be63.zip | |
x86/tsc: Prevent NULL pointer deref in calibrate_delay_is_known()
The topology_core_cpumask is used to find a neighbour cpu in
calibrate_delay_is_known(). It might not be allocated at the first invocation
of that function on the boot cpu, when CONFIG_CPUMASK_OFFSTACK is set.
The mask is allocated later in native_smp_prepare_cpus. As a consequence the
underlying find_next_bit() call dereferences a NULL pointer.
Add a proper check to prevent this.
Fixes: c25323c07345 "x86/tsc: Use topology functions"
Reported-and-tested-by: Richard W.M. Jones <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Josh Boyer <[email protected]>
Link: http://lkml.kernel.org/r/alpine.DEB.2.11.1603180843270.3978@nanos
Signed-off-by: Thomas Gleixner <[email protected]>
Diffstat (limited to 'net/switchdev/switchdev.c')
0 files changed, 0 insertions, 0 deletions