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bpf: Return -EBADRQC for invalid map type in __bpf_tx_xdp_map

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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@baidu.com
This commit is contained in:
Li RongQing 2020-01-10 09:04:37 +08:00 committed by Daniel Borkmann
parent 3b4130418f
commit 0a29275b63
1 changed files with 1 additions and 1 deletions
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net/core/filter.c
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@ -3522,7 +3522,7 @@ static int __bpf_tx_xdp_map(struct net_device *dev_rx, void *fwd,
case BPF_MAP_TYPE_XSKMAP:
return __xsk_map_redirect(fwd, xdp);
default:
break;
return -EBADRQC;
}
return 0;
}