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bpf: dev_map_alloc() shouldn't return NULL

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We forgot to set the error code on two error paths which means that we
return ERR_PTR(0) which is NULL.  The caller, find_and_alloc_map(), is
not expecting that and will have a NULL dereference.

Fixes: 546ac1ffb70d ("bpf: add devmap, a map for storing net device references")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dan Carpenter 2017-07-22 10:40:04 +03:00 committed by David S. Miller
parent 1bb79284fc
commit 241a974ba2
1 changed files with 1 additions and 0 deletions
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kernel/bpf/devmap.c
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@ -114,6 +114,7 @@ static struct bpf_map *dev_map_alloc(union bpf_attr *attr)
if (err)
goto free_dtab;
err = -ENOMEM;
/* A per cpu bitfield with a bit per possible net device */
dtab->flush_needed = __alloc_percpu(
BITS_TO_LONGS(attr->max_entries) *