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- From 82014a5fa9930b0875e57869265acf011772277c Mon Sep 17 00:00:00 2001
- From: Stijn Tintel <stijn@linux-ipv6.be>
- Date: Sun, 3 May 2020 20:56:58 +0300
- Subject: [PATCH] network: avoid segfault in freeaddrinfo
-
- Calling freeaddrinfo(NULL) when using musl libc causes a segfault.
-
- Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>
- ---
- anet.c | 15 ++++++++++++---
- net_io.c | 5 ++++-
- viewadsb.c | 5 ++++-
- 3 files changed, 20 insertions(+), 5 deletions(-)
-
- diff --git a/anet.c b/anet.c
- index 5c35ff8..7f01958 100644
- --- a/anet.c
- +++ b/anet.c
- @@ -212,7 +212,10 @@ static int anetTcpGenericConnect(char *err, char *addr, char *service, int flags
- if (ss) {
- memcpy(ss, p->ai_addr, sizeof(*ss));
- }
- - freeaddrinfo(gai_result);
- + if (gai_result) {
- + freeaddrinfo(gai_result);
- + gai_result = NULL;
- + }
- return s;
- }
-
- @@ -220,7 +223,10 @@ static int anetTcpGenericConnect(char *err, char *addr, char *service, int flags
- anetCloseSocket(s);
- }
-
- - freeaddrinfo(gai_result);
- + if (gai_result) {
- + freeaddrinfo(gai_result);
- + gai_result = NULL;
- + }
- return ANET_ERR;
- }
-
- @@ -368,7 +374,10 @@ int anetTcpServer(char *err, char *service, char *bindaddr, int *fds, int nfds)
- fds[i++] = s;
- }
-
- - freeaddrinfo(gai_result);
- + if (gai_result) {
- + freeaddrinfo(gai_result);
- + gai_result = NULL;
- + }
- return (i > 0 ? i : ANET_ERR);
- }
-
- diff --git a/net_io.c b/net_io.c
- index 1f4d848..5f59194 100644
- --- a/net_io.c
- +++ b/net_io.c
- @@ -3285,7 +3285,10 @@ void cleanupNetwork(void) {
- for (int i = 0; i < Modes.net_connectors_count; i++) {
- struct net_connector *con = Modes.net_connectors[i];
- free(con->address);
- - freeaddrinfo(con->addr_info);
- + if (con->addr_info) {
- + freeaddrinfo(con->addr_info);
- + con->addr_info = NULL;
- + }
- if (con->mutex) {
- pthread_mutex_unlock(con->mutex);
- pthread_mutex_destroy(con->mutex);
- diff --git a/viewadsb.c b/viewadsb.c
- index 5fc5386..ad7b1bd 100644
- --- a/viewadsb.c
- +++ b/viewadsb.c
- @@ -308,7 +308,10 @@ int main(int argc, char **argv) {
- }
- // Free local service and client
- if (s) free(s);
- - freeaddrinfo(con->addr_info);
- + if (con->addr_info) {
- + freeaddrinfo(con->addr_info);
- + con->addr_info = NULL;
- + }
- pthread_mutex_unlock(con->mutex);
- pthread_mutex_destroy(con->mutex);
- free(con->mutex);
- --
- 2.26.2
-
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