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| author | Eric Dumazet <eric.dumazet@gmail.com> | 2011-01-25 19:40:51 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2011-01-27 19:21:50 +0100 |
| commit | 88d4f0db7fa8785859c1d637f9aac210932b6216 (patch) | |
| tree | c03e79daa9101295614147dcb9b24ed04aef9a99 | |
| parent | 6fb1b304255efc5c4c93874ac8c066272e257e28 (diff) | |
| download | linux-88d4f0db7fa8785859c1d637f9aac210932b6216.tar.gz linux-88d4f0db7fa8785859c1d637f9aac210932b6216.tar.bz2 linux-88d4f0db7fa8785859c1d637f9aac210932b6216.zip | |
perf: Fix alloc_callchain_buffers()
Commit 927c7a9e92c4 ("perf: Fix race in callchains") introduced
a mismatch in the sizing of struct callchain_cpus_entries.
nr_cpu_ids must be used instead of num_possible_cpus(), or we
might get out of bound memory accesses on some machines.
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: David Miller <davem@davemloft.net>
Cc: Stephane Eranian <eranian@google.com>
CC: stable@kernel.org
LKML-Reference: <1295980851.3588.351.camel@edumazet-laptop>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
| -rw-r--r-- | kernel/perf_event.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/kernel/perf_event.c b/kernel/perf_event.c index 126a302c481c..852ae8c66502 100644 --- a/kernel/perf_event.c +++ b/kernel/perf_event.c @@ -1999,8 +1999,7 @@ static int alloc_callchain_buffers(void) * accessed from NMI. Use a temporary manual per cpu allocation * until that gets sorted out. */ - size = sizeof(*entries) + sizeof(struct perf_callchain_entry *) * - num_possible_cpus(); + size = offsetof(struct callchain_cpus_entries, cpu_entries[nr_cpu_ids]); entries = kzalloc(size, GFP_KERNEL); if (!entries) |