- markus@cvs.openbsd.org 2003/09/18 08:49:45

     [deattack.c misc.c session.c ssh-agent.c]
     more buffer allocation fixes; from Solar Designer; CAN-2003-0682;
     ok millert@

5 files changed, 35 insertions, 25 deletions

diff --git a/ChangeLog b/ChangeLog
index 0a73b994..fd254c76 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -6,6 +6,10 @@
    - markus@cvs.openbsd.org 2003/09/18 07:54:48
      [buffer.c]
      protect against double free; #660;  zardoz at users.sf.net
+   - markus@cvs.openbsd.org 2003/09/18 08:49:45
+     [deattack.c misc.c session.c ssh-agent.c]
+     more buffer allocation fixes; from Solar Designer; CAN-2003-0682;
+     ok millert@
 
 20030922
  - (dtucker) [Makefile.in] Bug #644: Fix "make clean" for out-of-tree
@@ -1171,4 +1175,4 @@
  - Fix sshd BindAddress and -b options for systems using fake-getaddrinfo.
    Report from murple@murple.net, diagnosis from dtucker@zip.com.au
 
-$Id: ChangeLog,v 1.2994.2.29 2003/09/23 08:55:43 dtucker Exp $
+$Id: ChangeLog,v 1.2994.2.30 2003/09/23 08:59:08 dtucker Exp $
diff --git a/deattack.c b/deattack.c
index 0442501e..8b55d668 100644
--- a/deattack.c
+++ b/deattack.c
@@ -18,7 +18,7 @@
  */
 
 #include "includes.h"
-RCSID("$OpenBSD: deattack.c,v 1.18 2002/03/04 17:27:39 stevesk Exp $");
+RCSID("$OpenBSD: deattack.c,v 1.19 2003/09/18 08:49:45 markus Exp $");
 
 #include "deattack.h"
 #include "log.h"
@@ -100,12 +100,12 @@ detect_attack(u_char *buf, u_int32_t len, u_char *IV)
 
 	if (h == NULL) {
 		debug("Installing crc compensation attack detector.");
+		h = (u_int16_t *) xmalloc(l * HASH_ENTRYSIZE);
 		n = l;
-		h = (u_int16_t *) xmalloc(n * HASH_ENTRYSIZE);
 	} else {
 		if (l > n) {
+			h = (u_int16_t *) xrealloc(h, l * HASH_ENTRYSIZE);
 			n = l;
-			h = (u_int16_t *) xrealloc(h, n * HASH_ENTRYSIZE);
 		}
 	}
 
diff --git a/misc.c b/misc.c
index c457a952..ac616de0 100644
--- a/misc.c
+++ b/misc.c
@@ -23,7 +23,7 @@
  */
 
 #include "includes.h"
-RCSID("$OpenBSD: misc.c,v 1.21 2003/04/12 10:15:36 markus Exp $");
+RCSID("$OpenBSD: misc.c,v 1.22 2003/09/18 08:49:45 markus Exp $");
 
 #include "misc.h"
 #include "log.h"
@@ -308,18 +308,21 @@ addargs(arglist *args, char *fmt, ...)
 {
 	va_list ap;
 	char buf[1024];
+	int nalloc;
 
 	va_start(ap, fmt);
 	vsnprintf(buf, sizeof(buf), fmt, ap);
 	va_end(ap);
 
+	nalloc = args->nalloc;
 	if (args->list == NULL) {
-		args->nalloc = 32;
+		nalloc = 32;
 		args->num = 0;
-	} else if (args->num+2 >= args->nalloc)
-		args->nalloc *= 2;
+	} else if (args->num+2 >= nalloc)
+		nalloc *= 2;
 
-	args->list = xrealloc(args->list, args->nalloc * sizeof(char *));
+	args->list = xrealloc(args->list, nalloc * sizeof(char *));
+	args->nalloc = nalloc;
 	args->list[args->num++] = xstrdup(buf);
 	args->list[args->num] = NULL;
 }
diff --git a/session.c b/session.c
index 616fee97..2898ac51 100644
--- a/session.c
+++ b/session.c
@@ -33,7 +33,7 @@
  */
 
 #include "includes.h"
-RCSID("$OpenBSD: session.c,v 1.163 2003/08/31 13:29:05 markus Exp $");
+RCSID("$OpenBSD: session.c,v 1.164 2003/09/18 08:49:45 markus Exp $");
 
 #include "ssh.h"
 #include "ssh1.h"
@@ -798,8 +798,9 @@ void
 child_set_env(char ***envp, u_int *envsizep, const char *name,
 	const char *value)
 {
-	u_int i, namelen;
 	char **env;
+	u_int envsize;
+	u_int i, namelen;
 
 	/*
 	 * If we're passed an uninitialized list, allocate a single null
@@ -826,12 +827,13 @@ child_set_env(char ***envp, u_int *envsizep, const char *name,
 		xfree(env[i]);
 	} else {
 		/* New variable.  Expand if necessary. */
-		if (i >= (*envsizep) - 1) {
-			if (*envsizep >= 1000)
-				fatal("child_set_env: too many env vars,"
-				    " skipping: %.100s", name);
-			(*envsizep) += 50;
-			env = (*envp) = xrealloc(env, (*envsizep) * sizeof(char *));
+		envsize = *envsizep;
+		if (i >= envsize - 1) {
+			if (envsize >= 1000)
+				fatal("child_set_env: too many env vars");
+			envsize += 50;
+			env = (*envp) = xrealloc(env, envsize * sizeof(char *));
+			*envsizep = envsize;
 		}
 		/* Need to set the NULL pointer at end of array beyond the new slot. */
 		env[i + 1] = NULL;
diff --git a/ssh-agent.c b/ssh-agent.c
index c05c6146..e1e6cae9 100644
--- a/ssh-agent.c
+++ b/ssh-agent.c
@@ -35,7 +35,7 @@
 
 #include "includes.h"
 #include "openbsd-compat/sys-queue.h"
-RCSID("$OpenBSD: ssh-agent.c,v 1.111 2003/06/12 19:12:03 markus Exp $");
+RCSID("$OpenBSD: ssh-agent.c,v 1.112 2003/09/18 08:49:45 markus Exp $");
 
 #include <openssl/evp.h>
 #include <openssl/md5.h>
@@ -784,7 +784,7 @@ process_message(SocketEntry *e)
 static void
 new_socket(sock_type type, int fd)
 {
-	u_int i, old_alloc;
+	u_int i, old_alloc, new_alloc;
 
 	if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0)
 		error("fcntl O_NONBLOCK: %s", strerror(errno));
@@ -795,25 +795,26 @@ new_socket(sock_type type, int fd)
 	for (i = 0; i < sockets_alloc; i++)
 		if (sockets[i].type == AUTH_UNUSED) {
 			sockets[i].fd = fd;
-			sockets[i].type = type;
 			buffer_init(&sockets[i].input);
 			buffer_init(&sockets[i].output);
 			buffer_init(&sockets[i].request);
+			sockets[i].type = type;
 			return;
 		}
 	old_alloc = sockets_alloc;
-	sockets_alloc += 10;
+	new_alloc = sockets_alloc + 10;
 	if (sockets)
-		sockets = xrealloc(sockets, sockets_alloc * sizeof(sockets[0]));
+		sockets = xrealloc(sockets, new_alloc * sizeof(sockets[0]));
 	else
-		sockets = xmalloc(sockets_alloc * sizeof(sockets[0]));
-	for (i = old_alloc; i < sockets_alloc; i++)
+		sockets = xmalloc(new_alloc * sizeof(sockets[0]));
+	for (i = old_alloc; i < new_alloc; i++)
 		sockets[i].type = AUTH_UNUSED;
-	sockets[old_alloc].type = type;
+	sockets_alloc = new_alloc;
 	sockets[old_alloc].fd = fd;
 	buffer_init(&sockets[old_alloc].input);
 	buffer_init(&sockets[old_alloc].output);
 	buffer_init(&sockets[old_alloc].request);
+	sockets[old_alloc].type = type;
 }
 
 static int