[dpdk-dev] [PATCH] examples/performance-thread: fix out-of-bounds read

[Slawomir Mrozowicz <slawomirx.mrozowicz@intel.com>]

Overrunning array schedcore of 128 8-byte elements at element index 128
using index lcore_id.
Fixed by correct check index lcoreid condition and
change type of lcoreid to unsigned.

Coverity issue: 143459
Fixes: 116819b9ed0d ("examples/performance-thread: add lthread subsystem")
Cc: ian.betts@intel.com
Cc: stable@dpdk.org

Signed-off-by: Slawomir Mrozowicz <slawomirx.mrozowicz@intel.com>
---
 examples/performance-thread/common/lthread.h       |  2 +-
 examples/performance-thread/common/lthread_sched.c | 11 +++++++----
 2 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/examples/performance-thread/common/lthread.h b/examples/performance-thread/common/lthread.h
index 5c2c1a5f0..0cde5919b 100644
--- a/examples/performance-thread/common/lthread.h
+++ b/examples/performance-thread/common/lthread.h
@@ -87,7 +87,7 @@ int _lthread_desched_sleep(struct lthread *lt);
 
 void _lthread_free(struct lthread *lt);
 
-struct lthread_sched *_lthread_sched_get(int lcore_id);
+struct lthread_sched *_lthread_sched_get(unsigned int lcore_id);
 
 struct lthread_stack *_stack_alloc(void);
 
diff --git a/examples/performance-thread/common/lthread_sched.c b/examples/performance-thread/common/lthread_sched.c
index 98291478e..3484387b4 100644
--- a/examples/performance-thread/common/lthread_sched.c
+++ b/examples/performance-thread/common/lthread_sched.c
@@ -562,11 +562,14 @@ void lthread_run(void)
  * Return the scheduler for this lcore
  *
  */
-struct lthread_sched *_lthread_sched_get(int lcore_id)
+struct lthread_sched *_lthread_sched_get(unsigned int lcore_id)
 {
-	if (lcore_id > LTHREAD_MAX_LCORES)
-		return NULL;
-	return schedcore[lcore_id];
+	struct lthread_sched *res = NULL;
+
+	if (lcore_id < LTHREAD_MAX_LCORES)
+		res = schedcore[lcore_id];
+
+	return res;
 }
 
 /*
-- 
2.11.0