Commit-ID: 8696329b7bcf32e69ad12d5975ad1497936d43ec
Gitweb: http://git.kernel.org/tip/8696329b7bcf32e69ad12d5975ad1497936d43ec
Author: Cody Schafer <cody@xxxxxxxxxxxxxxxxxx>
AuthorDate: Thu, 19 Jul 2012 20:05:25 -0700
Committer: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Wed, 25 Jul 2012 13:06:42 -0300
perf annotate: Prevent overflow in size calculation
A large enough symbol size causes an overflow in the size parameter to
the histogram allocation, leading to a segfault in
symbol__inc_addr_samples later on when this histogram is accessed.
In the case of being called via perf-report, this returns back and
gracefully ignores the sample, eventually ignoring the chained return
value of perf_session_deliver_event in flush_sample_queue.
Signed-off-by: Cody Schafer <cody@xxxxxxxxxxxxxxxxxx>
Acked-by: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Sukadev Bhattiprolu <sukadev@xxxxxxxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/1342753525-4521-1-git-send-email-cody@xxxxxxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
tools/perf/util/annotate.c | 13 ++++++++++++-
1 files changed, 12 insertions(+), 1 deletions(-)
diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index 7d3641f..3a282c0 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -426,7 +426,18 @@ int symbol__alloc_hist(struct symbol *sym)
{
struct annotation *notes = symbol__annotation(sym);
const size_t size = symbol__size(sym);
- size_t sizeof_sym_hist = (sizeof(struct sym_hist) + size * sizeof(u64));
+ size_t sizeof_sym_hist;
+
+ /* Check for overflow when calculating sizeof_sym_hist */
+ if (size > (SIZE_MAX - sizeof(struct sym_hist)) / sizeof(u64))
+ return -1;
+
+ sizeof_sym_hist = (sizeof(struct sym_hist) + size * sizeof(u64));
+
+ /* Check for overflow in zalloc argument */
+ if (sizeof_sym_hist > (SIZE_MAX - sizeof(*notes->src))
+ / symbol_conf.nr_events)
+ return -1;
notes->src = zalloc(sizeof(*notes->src) + symbol_conf.nr_events * sizeof_sym_hist);
if (notes->src == NULL)
--
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