3.19.8-ckt2 -stable review patch. If anyone has any objections, please let me know.
------------------ From: Toshiaki Makita <[email protected]> commit c0a06ee185f2b785c7bd44c4fb6fcae80f7d1a54 upstream. When changing the number of rings by ethtool -L, q_vectors are reused, which causes oops because of uninitialized pointers. - When an rx is reused as a tx, q_vector->rx.ring is not set to NULL, which misleads igb_poll() to determine that it has an rx ring although it actually points to the tx ring. - When a tx is reused as an rx, q_vector->rx.ring->skb (q_vector->ring[0].skb) has a value that was used as tx_stats before. Fix these problems by zeroing it out on reuseing it. Fixes: 02ef6e1d0b00 ("igb: Fix queue allocation method to accommodate changing during runtime") Signed-off-by: Toshiaki Makita <[email protected]> Tested-by: Aaron Brown <[email protected]> Signed-off-by: Jeff Kirsher <[email protected]> Signed-off-by: Kamal Mostafa <[email protected]> --- drivers/net/ethernet/intel/igb/igb_main.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c index ff59897..51417a0 100644 --- a/drivers/net/ethernet/intel/igb/igb_main.c +++ b/drivers/net/ethernet/intel/igb/igb_main.c @@ -1207,6 +1207,8 @@ static int igb_alloc_q_vector(struct igb_adapter *adapter, q_vector = adapter->q_vector[v_idx]; if (!q_vector) q_vector = kzalloc(size, GFP_KERNEL); + else + memset(q_vector, 0, size); if (!q_vector) return -ENOMEM; -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
