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authorDimitri Staessens <dimitri@ouroboros.rocks>2022-03-07 18:15:58 +0100
committerSander Vrijders <sander@ouroboros.rocks>2022-03-08 17:40:18 +0100
commita7032da6bbe875596ea1cb348a747123cda7d408 (patch)
treee6b00543a4199294c06d6bfb42bd1afb293b729d /src/ipcpd
parent2db119dd5c3e9a1ffc1360bde181a030c08bfce2 (diff)
downloadouroboros-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 <dimitri@ouroboros.rocks> Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
Diffstat (limited to 'src/ipcpd')
-rw-r--r--src/ipcpd/eth/eth.c6
-rw-r--r--src/ipcpd/udp/main.c6
-rw-r--r--src/ipcpd/unicast/fa.c6
3 files changed, 12 insertions, 6 deletions
diff --git a/src/ipcpd/eth/eth.c b/src/ipcpd/eth/eth.c
index f62bd0a7..25f42fc8 100644
--- a/src/ipcpd/eth/eth.c
+++ b/src/ipcpd/eth/eth.c
@@ -496,7 +496,8 @@ static int eth_ipcp_alloc(const uint8_t * dst_addr,
msg->timeout = hton32(qs.timeout);
memcpy(msg + 1, hash, ipcp_dir_hash_len());
- memcpy(buf + len + ETH_HEADER_TOT_SIZE, data, dlen);
+ if (dlen > 0)
+ memcpy(buf + len + ETH_HEADER_TOT_SIZE, data, dlen);
ret = eth_ipcp_send_frame(dst_addr,
#if defined(BUILD_ETH_DIX)
@@ -542,7 +543,8 @@ static int eth_ipcp_alloc_resp(uint8_t * dst_addr,
#endif
msg->response = response;
- memcpy(msg + 1, data, len);
+ if (len > 0)
+ memcpy(msg + 1, data, len);
if (eth_ipcp_send_frame(dst_addr,
#if defined(BUILD_ETH_DIX)
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,
diff --git a/src/ipcpd/unicast/fa.c b/src/ipcpd/unicast/fa.c
index eb467a90..508f2d73 100644
--- a/src/ipcpd/unicast/fa.c
+++ b/src/ipcpd/unicast/fa.c
@@ -847,7 +847,8 @@ int fa_alloc(int fd,
msg->timeout = hton32(qs.timeout);
memcpy(msg + 1, dst, ipcp_dir_hash_len());
- memcpy(shm_du_buff_head(sdb) + len, data, dlen);
+ if (dlen > 0)
+ memcpy(shm_du_buff_head(sdb) + len, data, dlen);
if (dt_write_packet(addr, qc, fa.eid, sdb)) {
ipcp_sdb_release(sdb);
@@ -897,7 +898,8 @@ int fa_alloc_resp(int fd,
msg->s_eid = hton64(flow->s_eid);
msg->response = response;
- memcpy(msg + 1, data, len);
+ if (len > 0)
+ memcpy(msg + 1, data, len);
if (response < 0) {
fa_flow_fini(flow);