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gve: fix the wrong AdminQ buffer overflow check

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[ Upstream commit 63a9192b8f ]

The 'tail' pointer is also free-running count, so it needs to be masked
as 'adminq_prod_cnt' does, to become an index value of AdminQ buffer.

Fixes: 5cdad90de6 ("gve: Batch AQ commands for creating and destroying queues.")
Signed-off-by: Haiyue Wang <haiyue.wang@intel.com>
Reviewed-by: Catherine Sullivan <csully@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Haiyue Wang 2021-07-14 15:34:59 +08:00 • committed by Greg Kroah-Hartman
commit f1673e8525
1 changed files with 4 additions and 2 deletions
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6
drivers/net/ethernet/google/gve/gve_adminq.c
View file

@ -182,7 +182,8 @@ static int gve_adminq_issue_cmd(struct gve_priv *priv,
tail = ioread32be(&priv->reg_bar0->adminq_event_counter);
// Check if next command will overflow the buffer.
if (((priv->adminq_prod_cnt + 1) & priv->adminq_mask) == tail) {
if (((priv->adminq_prod_cnt + 1) & priv->adminq_mask) ==
(tail & priv->adminq_mask)) {
int err;
// Flush existing commands to make room.
@ -192,7 +193,8 @@ static int gve_adminq_issue_cmd(struct gve_priv *priv,
// Retry.
tail = ioread32be(&priv->reg_bar0->adminq_event_counter);
if (((priv->adminq_prod_cnt + 1) & priv->adminq_mask) == tail) {
if (((priv->adminq_prod_cnt + 1) & priv->adminq_mask) ==
(tail & priv->adminq_mask)) {
// This should never happen. We just flushed the
// command queue so there should be enough space.
return -ENOMEM;