[PATCH] bpf: fix mem leak in error path of lwt bpf setup

[Mathieu Xhonneux]

In bpf_parse_prog, if bpf_prog_get_type fails, the function is
immediately terminated without freeing the previously allocated
prog->name.
This patch adds a kfree before the return.

Signed-off-by: Mathieu Xhonneux <m.xhonn...@gmail.com>
---
 net/core/lwt_bpf.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/core/lwt_bpf.c b/net/core/lwt_bpf.c
index e7e626fb87bb..e142a7a32e46 100644
--- a/net/core/lwt_bpf.c
+++ b/net/core/lwt_bpf.c
@@ -223,8 +223,10 @@ static int bpf_parse_prog(struct nlattr *attr, struct 
bpf_lwt_prog *prog,
 
        fd = nla_get_u32(tb[LWT_BPF_PROG_FD]);
        p = bpf_prog_get_type(fd, type);
-       if (IS_ERR(p))
+       if (IS_ERR(p)) {
+               kfree(prog->name);
                return PTR_ERR(p);
+       }
 
        prog->prog = p;
 
-- 
2.16.1