From: Björn Töpel <bjorn.topel@xxxxxxxxx>
Passing a non-existing option in the options member of struct
xdp_desc, incorrectly, silently ignored. This patch addresses that
behavior, and drops any Tx descriptor with non-existing options.
We have examined existing user space code, and to our best knowledge,
no one is relying on the current incorrect behavior. AF_XDP is still
in its infancy, so from our perspective, the risk of breakage is very
low, and addressing this problem now is important.
Fixes: 35fcde7f8deb ("xsk: support for Tx")
Signed-off-by: Björn Töpel <bjorn.topel@xxxxxxxxx>
---
net/xdp/xsk_queue.h | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/net/xdp/xsk_queue.h b/net/xdp/xsk_queue.h
index bcb5cbb40419..610c0bdc0c2b 100644
--- a/net/xdp/xsk_queue.h
+++ b/net/xdp/xsk_queue.h
@@ -174,8 +174,8 @@ static inline bool xskq_is_valid_desc(struct xsk_queue *q, struct xdp_desc *d)
if (!xskq_is_valid_addr(q, d->addr))
return false;
- if (((d->addr + d->len) & q->chunk_mask) !=
- (d->addr & q->chunk_mask)) {
+ if (((d->addr + d->len) & q->chunk_mask) != (d->addr & q->chunk_mask) ||
+ d->options) {
q->invalid_descs++;
return false;
}
--
2.19.1
