From: Alexei Starovoitov ast@kernel.org
[ Upstream commit a4fa458950b40d3849946daa32466392811a3716 ]
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 Signed-off-by: Sasha Levin sashal@kernel.org --- 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 4494ea6056cdb..42b88a92afe95 100644 --- a/net/bpfilter/bpfilter_kern.c +++ b/net/bpfilter/bpfilter_kern.c @@ -50,6 +50,7 @@ static int __bpfilter_process_sockopt(struct sock *sk, int optname, req.len = optlen; if (!bpfilter_ops.info.pid) goto out; + pos = 0; n = kernel_write(bpfilter_ops.info.pipe_to_umh, &req, sizeof(req), &pos); if (n != sizeof(req)) {