From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Wed, 16 Apr 2025 19:47:49 +0000 (+0900)
Subject: sd-netlink: prepare buffer for dropping unexpected message
X-Git-Tag: v258-rc1~800
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bf478dcffbc3c568fb3a3c8e8b93b3e7b66f4228;p=thirdparty%2Fsystemd.git

sd-netlink: prepare buffer for dropping unexpected message

Follow-up for c7460cce79fd358f2745bd390bd2e7ded450ee62 (v219).

Fixes #35654.
---

diff --git a/src/libsystemd/sd-netlink/netlink-socket.c b/src/libsystemd/sd-netlink/netlink-socket.c
index 9d2b3984c2b..5959959f427 100644
--- a/src/libsystemd/sd-netlink/netlink-socket.c
+++ b/src/libsystemd/sd-netlink/netlink-socket.c
@@ -181,6 +181,12 @@ static int socket_recv_message(int fd, void *buf, size_t buf_size, uint32_t *ret
                 log_debug("sd-netlink: ignoring message from PID %"PRIu32, sender.nl.nl_pid);
 
                 if (peek) {
+                        _cleanup_free_ uint8_t *b = new(uint8_t, n);
+                        if (!b)
+                                return -ENOMEM;
+
+                        iov = IOVEC_MAKE(b, n);
+
                         /* drop the message */
                         n = recvmsg_safe(fd, &msg, 0);
                         if (n < 0)