Merge pull request #2497 from brauner/2018-07-29/nl_fix

nl: avoid NULL pointer dereference

Merge pull request #2497 from brauner/2018-07-29/nl_fix
646b1be9 · Christian Brauner · GitHub · a4f181a4 · c8f05589 · 646b1be9
Unverified Commit 646b1be9 authored Jul 29, 2018 by Christian Brauner Committed by GitHub Jul 29, 2018
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nl.c src/lxc/nl.c +2 -1

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--- a/src/lxc/nl.c
+++ b/src/lxc/nl.c
@@ -61,7 +61,8 @@ static int nla_put(struct nlmsg *nlmsg, int attr,
 	rta = NLMSG_TAIL(nlmsg->nlmsghdr);
 	rta->rta_type = attr;
 	rta->rta_len = rtalen;
-	memcpy(RTA_DATA(rta), data, len);
+	if (data && len)
+		memcpy(RTA_DATA(rta), data, len);
 	nlmsg->nlmsghdr->nlmsg_len = tlen;
 	return 0;
 }