Patch from Colin Watson: we were sometimes passing stack storage to putenv(),

which is Bad (in his case, it caused TERM to end up unset). Use malloc()'d
storage instead.

git-svn-id: svn://svn.tartarus.org/sgt/putty@6095 cda61777-01e9-0310-a592-d414129be87e

diff --git a/unix/uxpty.c b/unix/uxpty.c
index b3bda08..96489e1 100644 (file)
--- a/unix/uxpty.c
+++ b/unix/uxpty.c
@@ -754,15 +754,19 @@ static const char *pty_init(void *frontend, void **backend_handle, Config *cfg,
        for (i = 3; i < 1024; i++)
            close(i);
        {
-           char term_env_var[10 + sizeof(cfg->termtype)];
-           sprintf(term_env_var, "TERM=%s", cfg->termtype);
+           char *term_env_var = dupprintf("TERM=%s", cfg->termtype);
            putenv(term_env_var);
+           /* We mustn't free term_env_var, as putenv links it into the
+            * environment in place.
+            */
        }
 #ifndef NOT_X_WINDOWS                 /* for Mac OS X native compilation */
        {
-           char windowid_env_var[40];
-           sprintf(windowid_env_var, "WINDOWID=%ld", windowid);
+           char *windowid_env_var = dupprintf("WINDOWID=%ld", windowid);
            putenv(windowid_env_var);
+           /* We mustn't free windowid_env_var, as putenv links it into the
+            * environment in place.
+            */
        }
 #endif
        {