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netdev: Enforce index cap in netdev_get_tx_queue

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When requesting a TX queue at a given index, warn on out-of-bounds
referencing if the index is greater than the allocated number of
queues.

Specifically, since this function is used heavily in the networking
stack use DEBUG_NET_WARN_ON_ONCE to avoid executing a new branch on
every packet.

Signed-off-by: Nick Child <nnac123@linux.ibm.com>
Link: https://lore.kernel.org/r/20230321150725.127229-2-nnac123@linux.ibm.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Nick Child 2023-03-21 10:07:25 -05:00 committed by Jakub Kicinski
parent 5dd0dfd55b
commit 1cc6571f56
1 changed files with 1 additions and 0 deletions
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include/linux/netdevice.h
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@ -2484,6 +2484,7 @@ static inline
struct netdev_queue *netdev_get_tx_queue(const struct net_device *dev,
unsigned int index)
{
DEBUG_NET_WARN_ON_ONCE(index >= dev->num_tx_queues);
return &dev->_tx[index];
}