From: Li RongQing lirongqing@baidu.com
[ Upstream commit 0a29275b6300f39f78a87f2038bbfe5bdbaeca47 ]
A negative value should be returned if map->map_type is invalid although that is impossible now, but if we run into such situation in future, then xdpbuff could be leaked.
Daniel Borkmann suggested:
-EBADRQC should be returned to stay consistent with generic XDP for the tracepoint output and not to be confused with -EOPNOTSUPP from other locations like dev_map_enqueue() when ndo_xdp_xmit is missing and such.
Suggested-by: Daniel Borkmann daniel@iogearbox.net Signed-off-by: Li RongQing lirongqing@baidu.com Signed-off-by: Daniel Borkmann daniel@iogearbox.net Link: https://lore.kernel.org/bpf/1578618277-18085-1-git-send-email-lirongqing@bai... Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- net/core/filter.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/core/filter.c b/net/core/filter.c index 453d9fd..4d6c5a5 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -3207,7 +3207,7 @@ static int __bpf_tx_xdp_map(struct net_device *dev_rx, void *fwd, return err; } default: - break; + return -EBADRQC; } return 0; }