From: Grant Grundler <grundler@xxxxxxxxxxxx>
[ 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@xxxxxxxxxx>
Reported-by: Yi Chou <yich@xxxxxxxxxx>
Reported-by: Shervin Oloumi <enlightened@xxxxxxxxxx>
Signed-off-by: Grant Grundler <grundler@xxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
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 1c1bb074f664..066abf9dc91e 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
@@ -625,6 +625,13 @@ 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);
--
2.35.1
