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author | Bui Quang Minh <minhquangbui99@gmail.com> | 2025-06-30 22:13:14 +0700 |
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committer | Paolo Abeni <pabeni@redhat.com> | 2025-07-03 11:23:03 +0200 |
commit | 5177373c31318c3c6a190383bfd232e6cf565c36 (patch) | |
tree | 544872488cc2a5026a7fbc990fb67d8af078479b /scripts/lib/kdoc/kdoc_files.py | |
parent | c9cbbe7ab6f31ba91c47c09eee75017d5b69462d (diff) |
virtio-net: xsk: rx: fix the frame's length check
When calling buf_to_xdp, the len argument is the frame data's length
without virtio header's length (vi->hdr_len). We check that len with
xsk_pool_get_rx_frame_size() + vi->hdr_len
to ensure the provided len does not larger than the allocated chunk
size. The additional vi->hdr_len is because in virtnet_add_recvbuf_xsk,
we use part of XDP_PACKET_HEADROOM for virtio header and ask the vhost
to start placing data from
hard_start + XDP_PACKET_HEADROOM - vi->hdr_len
not
hard_start + XDP_PACKET_HEADROOM
But the first buffer has virtio_header, so the maximum frame's length in
the first buffer can only be
xsk_pool_get_rx_frame_size()
not
xsk_pool_get_rx_frame_size() + vi->hdr_len
like in the current check.
This commit adds an additional argument to buf_to_xdp differentiate
between the first buffer and other ones to correctly calculate the maximum
frame's length.
Cc: stable@vger.kernel.org
Reviewed-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Fixes: a4e7ba702701 ("virtio_net: xsk: rx: support recv small mode")
Signed-off-by: Bui Quang Minh <minhquangbui99@gmail.com>
Link: https://patch.msgid.link/20250630151315.86722-2-minhquangbui99@gmail.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Diffstat (limited to 'scripts/lib/kdoc/kdoc_files.py')
0 files changed, 0 insertions, 0 deletions