[Intel-wired-lan] [net v3] igb: Check if num of q_vectors is smaller than max before array access.
Aleksandr Loktionov
aleksandr.loktionov at intel.com
Thu Apr 22 10:17:36 UTC 2021
Ensure that the adapter->q_vector[MAX_Q_VECTORS] array isn't accessed
beyond its size. It was fixed by using a local variable num_q_vectors
as a limit for loop index, and ensure that num_q_vectors is not bigger
than MAX_Q_VECTORS.
v2:fix commit message Reviewed-by tag
v2:fix commit message Fixes tag
Fixes: 047e0030f1e6 ("igb: add new data structure for handling interrupts and NAPI")
Signed-off-by: Aleksandr Loktionov <aleksandr.loktionov at intel.com>
Reviewed-by: Grzegorz Siwik <grzegorz.siwik at intel.com>
Reviewed-by: Arkadiusz Kubalewski <arkadiusz.kubalewski at intel.com>
Reviewed-by: Slawomir Laba <slawomirx.laba at intel.com>
Reviewed-by: Sylwester Dziedziuch <sylwesterx.dziedziuch at intel.com>
Reviewed-by: Mateusz Palczewski <mateusz.placzewski at intel.com>
---
drivers/net/ethernet/intel/igb/igb_main.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index 55051a492..2c601261f 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -929,6 +929,7 @@ static void igb_configure_msix(struct igb_adapter *adapter)
**/
static int igb_request_msix(struct igb_adapter *adapter)
{
+ unsigned int num_q_vectors = adapter->num_q_vectors;
struct net_device *netdev = adapter->netdev;
int i, err = 0, vector = 0, free_vector = 0;
@@ -937,7 +938,13 @@ static int igb_request_msix(struct igb_adapter *adapter)
if (err)
goto err_out;
- for (i = 0; i < adapter->num_q_vectors; i++) {
+ if (num_q_vectors > MAX_Q_VECTORS) {
+ num_q_vectors = MAX_Q_VECTORS;
+ dev_warn(&adapter->pdev->dev,
+ "The number of queue vectors (%d) is higher than max allowed (%d)\n",
+ adapter->num_q_vectors, MAX_Q_VECTORS);
+ }
+ for (i = 0; i < num_q_vectors; i++) {
struct igb_q_vector *q_vector = adapter->q_vector[i];
vector++;
--
2.17.1
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