af_unix: report error when no fd is to be sent

Fixes: #3624
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

diff --git a/src/lxc/af_unix.c b/src/lxc/af_unix.c
index 14d3160cddfa7dc92cf77ab714b6c8d1991eb81c..327b4df5bf6d47c1d1232595bc11392b2eb31b96 100644 (file)
--- a/src/lxc/af_unix.c
+++ b/src/lxc/af_unix.c
@@ -121,6 +121,9 @@ int lxc_abstract_unix_send_fds_iov(int fd, const int *sendfds, int num_sendfds,
        struct cmsghdr *cmsg = NULL;
        size_t cmsgbufsize = CMSG_SPACE(num_sendfds * sizeof(int));
 
+       if (num_sendfds <= 0)
+               return ret_errno(EINVAL);
+
        cmsgbuf = malloc(cmsgbufsize);
        if (!cmsgbuf)
                return ret_errno(-ENOMEM);