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bpf: Fix bpf_xdp_pointer return pointer

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[ Upstream commit bbd52178e249fe893ef4a9b87cde5b6c473b0a7c ]

For the case where offset + len == size, bpf_xdp_pointer should return a
valid pointer to the addr because that access is permitted. We should
only return NULL in the case where offset + len exceeds size.

Fixes: 3f364222d032 ("net: xdp: introduce bpf_xdp_pointer utility routine")
Signed-off-by: Joanne Koong <joannelkoong@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Acked-by: Lorenzo Bianconi <lorenzo@kernel.org>
Link: https://lore.kernel.org/bpf/20220722220105.2065466-1-joannelkoong@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Joanne Koong 2022-07-22 15:01:05 -07:00 committed by Greg Kroah-Hartman
parent 51622648d6
commit 7d68cf80fc
1 changed files with 1 additions and 1 deletions
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2
net/core/filter.c
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@ -3918,7 +3918,7 @@ static void *bpf_xdp_pointer(struct xdp_buff *xdp, u32 offset, u32 len)
offset -= frag_size;
}
out:
return offset + len < size ? addr + offset : NULL;
return offset + len <= size ? addr + offset : NULL;
}
BPF_CALL_4(bpf_xdp_load_bytes, struct xdp_buff *, xdp, u32, offset,