From a4fa458950b40d3849946daa32466392811a3716 Mon Sep 17 00:00:00 2001 From: Alexei Starovoitov Date: Tue, 14 Jul 2020 12:31:45 -0700 Subject: [PATCH] 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 --- net/bpfilter/bpfilter_kern.c | 1 + 1 file changed, 1 insertion(+) diff --git a/net/bpfilter/bpfilter_kern.c b/net/bpfilter/bpfilter_kern.c index 54f82c341e20..2c31e82cb953 100644 --- 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)) {