swtpm: fix memory leak related to tpmstate directory

This patch fixes a memory leak before process exit.

Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>

src/swtpm/cuse_tpm.c

@@ -1298,6 +1298,7 @@ static void ptm_cleanup(void)
 {
     pidfile_remove();
     log_global_free();
+    tpmstate_global_free();
 }
 
 static const struct cuse_lowlevel_ops clops = {

src/swtpm/swtpm.c

@@ -66,6 +66,7 @@
 #include "utils.h"
 #include "mainloop.h"
 #include "ctrlchannel.h"
+#include "tpmstate.h"
 
 /* local variables */
 static int notify_fd[2] = {-1, -1};
@@ -178,6 +179,7 @@ static void swtpm_cleanup(struct ctrlchannel *cc, struct server *server)
     ctrlchannel_free(cc);
     server_free(server);
     log_global_free();
+    tpmstate_global_free();
 }
 
 int swtpm_main(int argc, char **argv, const char *prgname, const char *iface)

src/swtpm/swtpm_chardev.c

@@ -69,6 +69,7 @@
 #ifdef WITH_VTPM_PROXY
 #include "vtpm_proxy.h"
 #endif
+#include "tpmstate.h"
 
 /* local variables */
 static int notify_fd[2] = {-1, -1};
@@ -199,6 +200,7 @@ static void swtpm_cleanup(struct ctrlchannel *cc)
     pidfile_remove();
     ctrlchannel_free(cc);
     log_global_free();
+    tpmstate_global_free();
 }
 
 int swtpm_chardev_main(int argc, char **argv, const char *prgname, const char *iface)

src/swtpm/tpmstate.c

@@ -60,6 +60,12 @@ int tpmstate_set_dir(char *tpmstatedir)
    return 0;
 }
 
+void tpmstate_global_free(void)
+{
+    free(g_tpmstatedir);
+    g_tpmstatedir = NULL;
+}
+
 const char *tpmstate_get_dir(void)
 {
     if (g_tpmstatedir)

src/swtpm/tpmstate.h

@@ -44,5 +44,6 @@ int tpmstate_set_dir(char *tpmstatdir);
 const char *tpmstate_get_dir(void);
 int tpmstate_set_mode(mode_t mode);
 mode_t tpmstate_get_mode(void);
+void tpmstate_global_free(void);
 
 #endif /* _SWTPM_TPMSTATE_H_ */