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authorDaniel Borkmann <daniel@iogearbox.net>2016-06-30 17:24:44 +0200
committerDavid S. Miller <davem@davemloft.net>2016-07-01 16:00:47 -0400
commit113214be7f6c98dd6d0435e4765aea8dea91662c (patch)
tree31d2c41c7af6991401c3aff11e7ade3317b4a614 /net/kcm
parent1aacde3d22c42281236155c1ef6d7a5aa32a826b (diff)
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bpf: refactor bpf_prog_get and type check into helper
Since bpf_prog_get() and program type check is used in a couple of places, refactor this into a small helper function that we can make use of. Since the non RO prog->aux part is not used in performance critical paths and a program destruction via RCU is rather very unlikley when doing the put, we shouldn't have an issue just doing the bpf_prog_get() + prog->type != type check, but actually not taking the ref at all (due to being in fdget() / fdput() section of the bpf fd) is even cleaner and makes the diff smaller as well, so just go for that. Callsites are changed to make use of the new helper where possible. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/kcm')
-rw-r--r--net/kcm/kcmsock.c8
1 files changed, 1 insertions, 7 deletions
diff --git a/net/kcm/kcmsock.c b/net/kcm/kcmsock.c
index 0b68ba730a06..cb39e05b166c 100644
--- a/net/kcm/kcmsock.c
+++ b/net/kcm/kcmsock.c
@@ -1765,18 +1765,12 @@ static int kcm_attach_ioctl(struct socket *sock, struct kcm_attach *info)
if (!csock)
return -ENOENT;
- prog = bpf_prog_get(info->bpf_fd);
+ prog = bpf_prog_get_type(info->bpf_fd, BPF_PROG_TYPE_SOCKET_FILTER);
if (IS_ERR(prog)) {
err = PTR_ERR(prog);
goto out;
}
- if (prog->type != BPF_PROG_TYPE_SOCKET_FILTER) {
- bpf_prog_put(prog);
- err = -EINVAL;
- goto out;
- }
-
err = kcm_attach(sock, csock, prog);
if (err) {
bpf_prog_put(prog);