All attributes are passed by copy, so user data should be copied too.

Signed-off-by: Carlos Falgueras García <carlo...@riseup.net>
---
 src/set_elem.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/set_elem.c b/src/set_elem.c
index 990be24..b9c7e1e 100644
--- a/src/set_elem.c
+++ b/src/set_elem.c
@@ -125,8 +125,14 @@ void nftnl_set_elem_set(struct nftnl_set_elem *s, uint16_t 
attr,
                s->timeout = *((uint64_t *)data);
                break;
        case NFTNL_SET_ELEM_USERDATA: /* NFTA_SET_ELEM_USERDATA */
-               s->user.data = (void *)data;
-               s->user.len  = data_len;
+               if (s->user.data != NULL)
+                       xfree(s->user.data);
+
+               s->user.data = malloc(data_len);
+               if (!s->user.data)
+                       return;
+               memcpy(s->user.data, data, data_len);
+               s->user.len = data_len;
                break;
        default:
                return;
-- 
2.8.2

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