From: Grant Grundler grundler@chromium.org
[ Upstream commit 2120b7f4d128433ad8c5f503a9584deba0684901 ]
Bounds check hw_head index provided by NIC to verify it lies within the TX buffer ring.
Reported-by: Aashay Shringarpure aashay@google.com Reported-by: Yi Chou yich@google.com Reported-by: Shervin Oloumi enlightened@google.com Signed-off-by: Grant Grundler grundler@chromium.org Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_b0.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_b0.c b/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_b0.c index c4f914a29c38..bdb0b37c048a 100644 --- a/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_b0.c +++ b/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_b0.c @@ -637,6 +637,13 @@ static int hw_atl_b0_hw_ring_tx_head_update(struct aq_hw_s *self, err = -ENXIO; goto err_exit; } + + /* Validate that the new hw_head_ is reasonable. */ + if (hw_head_ >= ring->size) { + err = -ENXIO; + goto err_exit; + } + ring->hw_head = hw_head_; err = aq_hw_err_from_flags(self);