File libpcap-CVE-2023-7256.patch of Package libpcap

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File libpcap-CVE-2023-7256.patch of Package libpcap

From 2aa69b04d8173b18a0e3492e0c8f2f7fabdf642d Mon Sep 17 00:00:00 2001
From: Guy Harris <gharris@sonic.net>
Date: Thu, 28 Sep 2023 00:37:57 -0700
Subject: [PATCH] Have sock_initaddress() return the list of addrinfo
 structures or NULL.

Its return address is currently 0 for success and -1 for failure, with a
pointer to the first element of the list of struct addrinfos returned
through a pointer on success; change it to return that pointer on
success and NULL on failure.

That way, we don't have to worry about what happens to the pointer
pointeed to by the argument in question on failure; we know that we got
NULL back if no struct addrinfos were found because getaddrinfo()
failed.  Thus, we know that we have something to free iff
sock_initaddress() returned a pointer to that something rather than
returning NULL.

This avoids a double-free in some cases.

---
 pcap-rpcap.c    | 48 ++++++++++++++++++++--------------------
 rpcapd/daemon.c |  8 +++++--
 rpcapd/rpcapd.c |  8 +++++--
 sockutils.c     | 58 ++++++++++++++++++++++++++++---------------------
 sockutils.h     |  5 ++---
 5 files changed, 72 insertions(+), 55 deletions(-)

Index: libpcap-1.10.1/pcap-rpcap.c
===================================================================
--- libpcap-1.10.1.orig/pcap-rpcap.c
+++ libpcap-1.10.1/pcap-rpcap.c
@@ -995,7 +995,6 @@ rpcap_remoteact_getsock(const char *host
 {
 	struct activehosts *temp;			/* temp var needed to scan the host list chain */
 	struct addrinfo hints, *addrinfo, *ai_next;	/* temp var needed to translate between hostname to its address */
-	int retval;
 
 	/* retrieve the network address corresponding to 'host' */
 	addrinfo = NULL;
@@ -1003,9 +1002,9 @@ rpcap_remoteact_getsock(const char *host
 	hints.ai_family = PF_UNSPEC;
 	hints.ai_socktype = SOCK_STREAM;
 
-	retval = sock_initaddress(host, "0", &hints, &addrinfo, errbuf,
+	addrinfo = sock_initaddress(host, "0", &hints, errbuf,
 	    PCAP_ERRBUF_SIZE);
-	if (retval != 0)
+	if (addrinfo == NULL)
 	{
 		*error = 1;
 		return NULL;
@@ -1151,7 +1150,9 @@ static int pcap_startcapture_remote(pcap
 		hints.ai_flags = AI_PASSIVE;	/* Data connection is opened by the server toward the client */
 
 		/* Let's the server pick up a free network port for us */
-		if (sock_initaddress(NULL, "0", &hints, &addrinfo, fp->errbuf, PCAP_ERRBUF_SIZE) == -1)
+		addrinfo = sock_initaddress(NULL, "0", &hints, fp->errbuf,
+		    PCAP_ERRBUF_SIZE);
+		if (addrinfo == NULL)
 			goto error_nodiscard;
 
 		if ((sockdata = sock_open(addrinfo, SOCKOPEN_SERVER,
@@ -1263,7 +1264,9 @@ static int pcap_startcapture_remote(pcap
 			snprintf(portdata, PCAP_BUF_SIZE, "%d", ntohs(startcapreply.portdata));
 
 			/* Let's the server pick up a free network port for us */
-			if (sock_initaddress(host, portdata, &hints, &addrinfo, fp->errbuf, PCAP_ERRBUF_SIZE) == -1)
+			addrinfo = sock_initaddress(host, portstring, &hints,
+			    fp->errbuf, PCAP_ERRBUF_SIZE);
+			if (addrinfo == NULL)
 				goto error;
 
 			if ((sockdata = sock_open(addrinfo, SOCKOPEN_CLIENT, 0, fp->errbuf, PCAP_ERRBUF_SIZE)) == INVALID_SOCKET)
@@ -2206,16 +2209,16 @@ rpcap_setup_session(const char *source,
 		if (port[0] == 0)
 		{
 			/* the user chose not to specify the port */
-			if (sock_initaddress(host, RPCAP_DEFAULT_NETPORT,
-			    &hints, &addrinfo, errbuf, PCAP_ERRBUF_SIZE) == -1)
-				return -1;
+			addrinfo = sock_initaddress(host, RPCAP_DEFAULT_NETPORT,
+			    &hints, errbuf, PCAP_ERRBUF_SIZE);
 		}
 		else
 		{
-			if (sock_initaddress(host, port, &hints, &addrinfo,
-			    errbuf, PCAP_ERRBUF_SIZE) == -1)
-				return -1;
+			addrinfo = sock_initaddress(host, port, &hints,
+			    errbuf, PCAP_ERRBUF_SIZE);
 		}
+		if (addrinfo == NULL)
+			return -1;
 
 		if ((*sockctrlp = sock_open(addrinfo, SOCKOPEN_CLIENT, 0,
 		    errbuf, PCAP_ERRBUF_SIZE)) == INVALID_SOCKET)
@@ -2811,19 +2814,19 @@ SOCKET pcap_remoteact_accept_ex(const ch
 	/* Do the work */
 	if ((port == NULL) || (port[0] == 0))
 	{
-		if (sock_initaddress(address, RPCAP_DEFAULT_NETPORT_ACTIVE, &hints, &addrinfo, errbuf, PCAP_ERRBUF_SIZE) == -1)
-		{
-			return (SOCKET)-2;
-		}
+		addrinfo = sock_initaddress(address,
+		    RPCAP_DEFAULT_NETPORT_ACTIVE, &hints, errbuf,
+		    PCAP_ERRBUF_SIZE);
 	}
 	else
 	{
-		if (sock_initaddress(address, port, &hints, &addrinfo, errbuf, PCAP_ERRBUF_SIZE) == -1)
-		{
-			return (SOCKET)-2;
-		}
+		addrinfo = sock_initaddress(address, port, &hints, errbuf,
+		    PCAP_ERRBUF_SIZE);
+	}
+	if (addrinfo == NULL)
+	{
+		return (SOCKET)-2;
 	}
-
 
 	if ((sockmain = sock_open(addrinfo, SOCKOPEN_SERVER, 1, errbuf, PCAP_ERRBUF_SIZE)) == INVALID_SOCKET)
 	{
@@ -2980,7 +2983,6 @@ int pcap_remoteact_close(const char *hos
 {
 	struct activehosts *temp, *prev;	/* temp var needed to scan the host list chain */
 	struct addrinfo hints, *addrinfo, *ai_next;	/* temp var needed to translate between hostname to its address */
-	int retval;
 
 	temp = activeHosts;
 	prev = NULL;
@@ -2991,9 +2993,9 @@ int pcap_remoteact_close(const char *hos
 	hints.ai_family = PF_UNSPEC;
 	hints.ai_socktype = SOCK_STREAM;
 
-	retval = sock_initaddress(host, "0", &hints, &addrinfo, errbuf,
+	addrinfo = sock_initaddress(host, "0", &hints, errbuf,
 	    PCAP_ERRBUF_SIZE);
-	if (retval != 0)
+	if (addrinfo == NULL)
 	{
 		return -1;
 	}
Index: libpcap-1.10.1/rpcapd/daemon.c
===================================================================
--- libpcap-1.10.1.orig/rpcapd/daemon.c
+++ libpcap-1.10.1/rpcapd/daemon.c
@@ -2065,7 +2065,9 @@ daemon_msg_startcap_req(uint8 ver, struc
 			goto error;
 		}
 
-		if (sock_initaddress(peerhost, portdata, &hints, &addrinfo, errmsgbuf, PCAP_ERRBUF_SIZE) == -1)
+		addrinfo = sock_initaddress(peerhost, portdata, &hints,
+					    errmsgbuf, PCAP_ERRBUF_SIZE);
+		if (addrinfo == NULL)
 			goto error;
 
 		if ((session->sockdata = sock_open(addrinfo, SOCKOPEN_CLIENT, 0, errmsgbuf, PCAP_ERRBUF_SIZE)) == INVALID_SOCKET)
@@ -2076,7 +2078,9 @@ daemon_msg_startcap_req(uint8 ver, struc
 		hints.ai_flags = AI_PASSIVE;
 
 		// Let's the server socket pick up a free network port for us
-		if (sock_initaddress(NULL, "0", &hints, &addrinfo, errmsgbuf, PCAP_ERRBUF_SIZE) == -1)
+		addrinfo = sock_initaddress(NULL, NULL, &hints, errmsgbuf,
+					    PCAP_ERRBUF_SIZE);
+		if (addrinfo == NULL)
 			goto error;
 
 		if ((session->sockdata = sock_open(addrinfo, SOCKOPEN_SERVER, 1 /* max 1 connection in queue */, errmsgbuf, PCAP_ERRBUF_SIZE)) == INVALID_SOCKET)
Index: libpcap-1.10.1/rpcapd/rpcapd.c
===================================================================
--- libpcap-1.10.1.orig/rpcapd/rpcapd.c
+++ libpcap-1.10.1/rpcapd/rpcapd.c
@@ -610,7 +610,9 @@ void main_startup(void)
 		//
 		// Get a list of sockets on which to listen.
 		//
-		if (sock_initaddress((address[0]) ? address : NULL, port, &mainhints, &addrinfo, errbuf, PCAP_ERRBUF_SIZE) == -1)
+		addrinfo = sock_initaddress((address[0]) ? address : NULL,
+		    port, &mainhints, errbuf, PCAP_ERRBUF_SIZE);
+		if (addrinfo == NULL)
 		{
 			rpcapd_log(LOGPRIO_DEBUG, "%s", errbuf);
 			return;
@@ -1347,7 +1349,9 @@ main_active(void *ptr)
 	memset(errbuf, 0, sizeof(errbuf));
 
 	// Do the work
-	if (sock_initaddress(activepars->address, activepars->port, &hints, &addrinfo, errbuf, PCAP_ERRBUF_SIZE) == -1)
+	addrinfo = sock_initaddress(activepars->address, activepars->port,
+	    &hints, errbuf, PCAP_ERRBUF_SIZE);
+	if (addrinfo == NULL)
 	{
 		rpcapd_log(LOGPRIO_DEBUG, "%s", errbuf);
 		return 0;
Index: libpcap-1.10.1/sockutils.c
===================================================================
--- libpcap-1.10.1.orig/sockutils.c
+++ libpcap-1.10.1/sockutils.c
@@ -704,31 +704,36 @@ get_gai_errstring(char *errbuf, int errb
  * \param errbuflen: length of the buffer that will contains the error. The error message cannot be
  * larger than 'errbuflen - 1' because the last char is reserved for the string terminator.
  *
- * \return '0' if everything is fine, '-1' if some errors occurred. The error message is returned
- * in the 'errbuf' variable. The addrinfo variable that has to be used in the following sockets calls is
- * returned into the addrinfo parameter.
+ * \return a pointer to the first element in a list of addrinfo structures
+ * if everything is fine, NULL if some errors occurred. The error message
+ * is returned in the 'errbuf' variable.
  *
- * \warning The 'addrinfo' variable has to be deleted by the programmer by calling freeaddrinfo() when
- * it is no longer needed.
+ * \warning The list of addrinfo structures returned has to be deleted by
+ * the programmer by calling freeaddrinfo() when it is no longer needed.
  *
  * \warning This function requires the 'hints' variable as parameter. The semantic of this variable is the same
  * of the one of the corresponding variable used into the standard getaddrinfo() socket function. We suggest
  * the programmer to look at that function in order to set the 'hints' variable appropriately.
  */
-int sock_initaddress(const char *host, const char *port,
-    struct addrinfo *hints, struct addrinfo **addrinfo, char *errbuf, int errbuflen)
+struct addrinfo *sock_initaddress(const char *host, const char *port,
+    struct addrinfo *hints, char *errbuf, int errbuflen)
 {
+	struct addrinfo *addrinfo;
 	int retval;
 
-	retval = getaddrinfo(host, port, hints, addrinfo);
+	retval = getaddrinfo(host, port == NULL ? "0", hints, &addrinfo);
 	if (retval != 0)
 	{
+		/*
+		 * That call failed.
+		 * Determine whether the problem is that the host is bad.
+		 */
 		if (errbuf)
 		{
 			get_gai_errstring(errbuf, errbuflen, "", retval,
 			    host, port);
 		}
-		return -1;
+		return NULL;
 	}
 	/*
 	 * \warning SOCKET: I should check all the accept() in order to bind to all addresses in case
@@ -743,30 +748,28 @@ int sock_initaddress(const char *host, c
 	 * ignore all addresses that are neither?  (What, no IPX
 	 * support? :-))
 	 */
-	if (((*addrinfo)->ai_family != PF_INET) &&
-	    ((*addrinfo)->ai_family != PF_INET6))
+	if ((addrinfo->ai_family != PF_INET) &&
+	    (addrinfo->ai_family != PF_INET6))
 	{
 		if (errbuf)
 			snprintf(errbuf, errbuflen, "getaddrinfo(): socket type not supported");
-		freeaddrinfo(*addrinfo);
-		*addrinfo = NULL;
-		return -1;
+		freeaddrinfo(addrinfo);
+		return NULL;
 	}
 
 	/*
 	 * You can't do multicast (or broadcast) TCP.
 	 */
-	if (((*addrinfo)->ai_socktype == SOCK_STREAM) &&
-	    (sock_ismcastaddr((*addrinfo)->ai_addr) == 0))
+	if ((addrinfo->ai_socktype == SOCK_STREAM) &&
+	    (sock_ismcastaddr(addrinfo->ai_addr) == 0))
 	{
 		if (errbuf)
 			snprintf(errbuf, errbuflen, "getaddrinfo(): multicast addresses are not valid when using TCP streams");
-		freeaddrinfo(*addrinfo);
-		*addrinfo = NULL;
-		return -1;
+		freeaddrinfo(addrinfo);
+		return NULL;
 	}
 
-	return 0;
+	return addrinfo;
 }
 
 /*
@@ -1668,7 +1671,6 @@ int sock_getascii_addrport(const struct
  */
 int sock_present2network(const char *address, struct sockaddr_storage *sockaddr, int addr_family, char *errbuf, int errbuflen)
 {
-	int retval;
 	struct addrinfo *addrinfo;
 	struct addrinfo hints;
 
@@ -1676,7 +1678,9 @@ int sock_present2network(const char *add
 
 	hints.ai_family = addr_family;
 
-	if ((retval = sock_initaddress(address, "22222" /* fake port */, &hints, &addrinfo, errbuf, errbuflen)) == -1)
+	addrinfo = sock_initaddress(address, "22222" /* fake port */, &hints,
+	    errbuf, errbuflen);
+	if (addrinfo == NULL)
 		return 0;
 
 	if (addrinfo->ai_family == PF_INET)
Index: libpcap-1.10.1/sockutils.h
===================================================================
--- libpcap-1.10.1.orig/sockutils.h
+++ libpcap-1.10.1/sockutils.h
@@ -129,9 +129,8 @@ int sock_init(char *errbuf, int errbufle
 void sock_cleanup(void);
 void sock_fmterror(const char *caller, int errcode, char *errbuf, int errbuflen);
 void sock_geterror(const char *caller, char *errbuf, int errbufsize);
-int sock_initaddress(const char *address, const char *port,
-    struct addrinfo *hints, struct addrinfo **addrinfo,
-    char *errbuf, int errbuflen);
+struct addrinfo *sock_initaddress(const char *address, const char *port,
+    struct addrinfo *hints, char *errbuf, int errbuflen);
 int sock_recv(SOCKET sock, SSL *, void *buffer, size_t size, int receiveall,
     char *errbuf, int errbuflen);
 int sock_recv_dgram(SOCKET sock, SSL *, void *buffer, size_t size,

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