X-Git-Url: https://git.distorted.org.uk/u/mdw/putty/blobdiff_plain/51e9d3c00a3471f284e89ec1f59f38ca25f10c5f..HEAD:/unix/uxagentc.c

diff --git a/unix/uxagentc.c b/unix/uxagentc.c
index 826e4394..5734a7b0 100644
--- a/unix/uxagentc.c
+++ b/unix/uxagentc.c
@@ -8,6 +8,7 @@
 #include <unistd.h>
 #include <sys/socket.h>
 #include <sys/un.h>
+#include <fcntl.h>
 
 #include "putty.h"
 #include "misc.h"
@@ -16,7 +17,8 @@
 
 int agent_exists(void)
 {
-    if (getenv("SSH_AUTH_SOCK") != NULL)
+    const char *p = getenv("SSH_AUTH_SOCK");
+    if (p && *p)
 	return TRUE;
     return FALSE;
 }
@@ -73,13 +75,12 @@ static int agent_select_result(int fd, int event)
     }
     conn->retlen += ret;
     if (conn->retsize == 4 && conn->retlen == 4) {
-	conn->retsize = GET_32BIT(conn->retbuf);
+	conn->retsize = toint(GET_32BIT(conn->retbuf) + 4);
 	if (conn->retsize <= 0) {
 	    conn->retbuf = NULL;
 	    conn->retlen = 0;
 	    goto done;
 	}
-	conn->retsize += 4;
 	assert(conn->retbuf == conn->sizebuf);
 	conn->retbuf = snewn(conn->retsize, char);
 	memcpy(conn->retbuf, conn->sizebuf, 4);
@@ -121,6 +122,8 @@ int agent_query(void *in, int inlen, void **out, int *outlen,
 	exit(1);
     }
 
+    cloexec(sock);
+
     addr.sun_family = AF_UNIX;
     strncpy(addr.sun_path, name, sizeof(addr.sun_path));
     if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) < 0) {