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| author | Dimitri Staessens <[email protected]> | 2022-03-07 18:15:58 +0100 |
|---|---|---|
| committer | Sander Vrijders <[email protected]> | 2022-03-08 17:40:18 +0100 |
| commit | a7032da6bbe875596ea1cb348a747123cda7d408 (patch) | |
| tree | e6b00543a4199294c06d6bfb42bd1afb293b729d /src/ipcpd/udp/main.c | |
| parent | 2db119dd5c3e9a1ffc1360bde181a030c08bfce2 (diff) | |
| download | ouroboros-a7032da6bbe875596ea1cb348a747123cda7d408.tar.gz ouroboros-a7032da6bbe875596ea1cb348a747123cda7d408.zip | |
ipcpd: Fix memcpy with NULL in piggyback API
If there is no piggyback data, memcpy was passed a NULL pointer in
memcpy(buf, NULL, 0) calls, which is undefined behaviour.
Signed-off-by: Dimitri Staessens <[email protected]>
Signed-off-by: Sander Vrijders <[email protected]>
Diffstat (limited to 'src/ipcpd/udp/main.c')
| -rw-r--r-- | src/ipcpd/udp/main.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/src/ipcpd/udp/main.c b/src/ipcpd/udp/main.c index 3b354ceb..7def856b 100644 --- a/src/ipcpd/udp/main.c +++ b/src/ipcpd/udp/main.c @@ -222,7 +222,8 @@ static int ipcp_udp_port_alloc(const struct sockaddr_in * r_saddr, msg->timeout = hton32(qs.timeout); memcpy(msg + 1, dst, ipcp_dir_hash_len()); - memcpy(buf + len, data, dlen); + if (dlen > 0) + memcpy(buf + len, data, dlen); if (sendto(udp_data.s_fd, msg, len + dlen, SENDTO_FLAGS, @@ -255,7 +256,8 @@ static int ipcp_udp_port_alloc_resp(const struct sockaddr_in * r_saddr, msg->d_eid = hton32(d_eid); msg->response = response; - memcpy(msg + 1, data, len); + if (len > 0) + memcpy(msg + 1, data, len); if (sendto(udp_data.s_fd, msg, sizeof(*msg) + len, SENDTO_FLAGS, |