From: Christian Brauner <christian.brauner@ubuntu.com>
Date: Thu, 15 Jul 2021 16:47:27 +0000 (+0200)
Subject: af_unix: report error when no fd is to be sent
X-Git-Tag: lxc-5.0.0~137^2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F3907%2Fhead;p=thirdparty%2Flxc.git

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 14d3160cd..327b4df5b 100644
--- 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);