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environment: fix up memory accesses when building envp

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This commit is contained in:
Ariadne Conill 2020-07-23 09:43:09 -06:00
parent a2f3169716
commit 2c556d8655
1 changed files with 13 additions and 9 deletions
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22
libifupdown/environment.c
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@ -28,21 +28,23 @@ lif_environment_push(char **env[], const char *name, const char *val)
/* create an initial envp: {"foo=bar", NULL} */
if (*env == NULL)
{
*env = calloc(1, sizeof (**env));
**env = strdup(buf);
*env = calloc(2, sizeof (char *));
(*env)[0] = strdup(buf);
(*env)[1] = NULL;
return true;
}
size_t nelems;
for (nelems = 0; *env[nelems] != NULL; nelems++)
for (nelems = 0; (*env)[nelems] != NULL; nelems++)
;
nelems += 1;
*env = realloc(*env, (nelems * sizeof (**env)));
/* NULL at end, plus next env var */
size_t allocelems = nelems + 2;
*env = realloc(*env, ((allocelems + 2) * sizeof (char *)));
*env[nelems] = strdup(buf);
*env[nelems + 1] = NULL;
(*env)[nelems] = strdup(buf);
(*env)[nelems + 1] = NULL;
return true;
}
@ -52,6 +54,8 @@ lif_environment_free(char **env[])
{
size_t nelems;
for (nelems = 0; *env[nelems] != NULL; nelems++)
free(*env[nelems]);
for (nelems = 0; (*env)[nelems] != NULL; nelems++)
free((*env)[nelems]);
free(*env);
}