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igc: Check if num of q_vectors is smaller than max before array access 

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.

Suggested-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
Signed-off-by: Sasha Neftin <sasha.neftin@intel.com>
Tested-by: Dvora Fuxbrumer <dvorax.fuxbrumer@linux.intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
This commit is contained in:
Sasha Neftin 2021-06-14 15:19:39 +03:00 committed by Tony Nguyen
parent e0bc64d31c
commit 373e2829e7
1 changed files with 8 additions and 1 deletions
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9
drivers/net/ethernet/intel/igc/igc_main.c
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@ -5125,6 +5125,7 @@ static irqreturn_t igc_msix_ring(int irq, void *data)
*/
static int igc_request_msix(struct igc_adapter *adapter)
{
unsigned int num_q_vectors = adapter->num_q_vectors;
int i = 0, err = 0, vector = 0, free_vector = 0;
struct net_device *netdev = adapter->netdev;
@ -5133,7 +5134,13 @@ static int igc_request_msix(struct igc_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 igc_q_vector *q_vector = adapter->q_vector[i];
vector++;