[dpdk-dev] [PATCH v3] examples/vm_power_manager: fix buffer overrun

[David Hunt <david.hunt@intel.com>]

The freqs array in freq_info struct has RTE_MAX_LCORE_FREQS elements,
yet the code can attempt to look at the index at  RTE_MAX_LCORE,
which may be greater than RTE_MAX_LCORE_FREQS. Fix to limit index to
RTE_MAX_LCORE_FREQS.

Fixes: d26c18c93260 ("examples/vm_power: cpu frequency in host")
Coverity issue: 337660
CC: stable@dpdk.org
Signed-off-by: David Hunt <david.hunt@intel.com>
Acked-by: Reshma Pattan <reshma.pattan@intel.com>

---
v2 - Rebase to 19.05 RC2.
v3 - add CC stable
---
 examples/vm_power_manager/power_manager.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/examples/vm_power_manager/power_manager.c b/examples/vm_power_manager/power_manager.c
index 9553455be..9d4e587b0 100644
--- a/examples/vm_power_manager/power_manager.c
+++ b/examples/vm_power_manager/power_manager.c
@@ -143,7 +143,7 @@ power_manager_get_current_frequency(unsigned core_num)
 	rte_spinlock_lock(&global_core_freq_info[core_num].power_sl);
 	index = rte_power_get_freq(core_num);
 	rte_spinlock_unlock(&global_core_freq_info[core_num].power_sl);
-	if (index >= RTE_MAX_LCORE)
+	if (index >= RTE_MAX_LCORE_FREQS)
 		freq = 0;
 	else
 		freq = global_core_freq_info[core_num].freqs[index];
-- 
2.17.1