bpfilter: Initialize pos variable

Make sure 'pos' is initialized to zero before calling kernel_write().

Fixes: d2ba09c17a06 ("net: add skeleton of bpfilter kernel module")
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

diff --git a/net/bpfilter/bpfilter_kern.c b/net/bpfilter/bpfilter_kern.c
index 54f82c341e20b38a510d11b280234ddebe370df9..2c31e82cb953af26badd724e6bbe3bc918625862 100644 (file)
--- a/net/bpfilter/bpfilter_kern.c
+++ b/net/bpfilter/bpfilter_kern.c
@@ -48,6 +48,7 @@ static int __bpfilter_process_sockopt(struct sock *sk, int optname,
        req.len = optlen;
        if (!bpfilter_ops.info.tgid)
                goto out;
+       pos = 0;
        n = kernel_write(bpfilter_ops.info.pipe_to_umh, &req, sizeof(req),
                           &pos);
        if (n != sizeof(req)) {