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| author | Vaibhav Nagarnaik <vnagarnaik@google.com> | 2012-10-11 03:40:27 +0400 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2012-10-11 20:21:48 +0400 |
| commit | 8e49f418c9632790bf456634742d34d97120a784 (patch) | |
| tree | dfe1caca880206a3cfb38c923e49a5af74071d87 /tools/perf/builtin-trace.c | |
| parent | 95cf59ea72331d0093010543b8951bb43f262cac (diff) | |
| download | linux-8e49f418c9632790bf456634742d34d97120a784.tar.xz | |
ring-buffer: Check for uninitialized cpu buffer before resizing
With a system where, num_present_cpus < num_possible_cpus, even if all
CPUs are online, non-present CPUs don't have per_cpu buffers allocated.
If per_cpu/<cpu>/buffer_size_kb is modified for such a CPU, it can cause
a panic due to NULL dereference in ring_buffer_resize().
To fix this, resize operation is allowed only if the per-cpu buffer has
been initialized.
Link: http://lkml.kernel.org/r/1349912427-6486-1-git-send-email-vnagarnaik@google.com
Cc: stable@vger.kernel.org # 3.5+
Signed-off-by: Vaibhav Nagarnaik <vnagarnaik@google.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'tools/perf/builtin-trace.c')
0 files changed, 0 insertions, 0 deletions