[PATCH 06/16] perf kvm: handle realloc failures

David Ahern
2013-05-26T00:26:44Z

Save previous pointer and free on failure.

Signed-off-by: David Ahern <dsahern@gmail.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Cc: Runzhen Wang <runzhen@linux.vnet.ibm.com>
---
tools/perf/builtin-kvm.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c
index 533501e..24b78ae 100644
--- a/tools/perf/builtin-kvm.c
+++ b/tools/perf/builtin-kvm.c
@@ -328,6 +328,7 @@ static int kvm_events_hash_fn(u64 key)
static bool kvm_event_expand(struct kvm_event *event, int vcpu_id)
{
int old_max_vcpu = event->max_vcpu;
+ void *prev;

if (vcpu_id < event->max_vcpu)
return true;
@@ -335,9 +336,11 @@ static bool kvm_event_expand(struct kvm_event *event, int vcpu_id)
while (event->max_vcpu <= vcpu_id)
event->max_vcpu += DEFAULT_VCPU_NUM;

+ prev = event->vcpu;
event->vcpu = realloc(event->vcpu,
event->max_vcpu * sizeof(*event->vcpu));
if (!event->vcpu) {
+ free(prev);
pr_err("Not enough memory\n");
return false;
}
--
1.7.10.1