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| author | Dmitry V. Levin <ldv@altlinux.org> | 2022-02-23 08:00:00 +0000 |
|---|---|---|
| committer | Dmitry V. Levin <ldv@altlinux.org> | 2022-02-24 09:20:44 +0000 |
| commit | 9e800c2928358cc9060eaa4f17b8f0a3a1269d65 (patch) | |
| tree | 6504158a6030f32668be833b247b5e3ecb4e2ea9 | |
| parent | 7c660b5fd94dd9bec54f2bc6587a2425f69be9d6 (diff) | |
| download | pam-9e800c2928358cc9060eaa4f17b8f0a3a1269d65.tar.gz pam-9e800c2928358cc9060eaa4f17b8f0a3a1269d65.tar.bz2 pam-9e800c2928358cc9060eaa4f17b8f0a3a1269d65.zip | |
pam_exec: remove redundant free() invocations
In the child process, freeing memory right before pam_syslog()
followed by _exit(ENOMEM) is useless.
* modules/pam_exec/pam_exec.c (call_exec): Do not call free(envlist).
Resolves: https://github.com/linux-pam/linux-pam/issues/444
| -rw-r--r-- | modules/pam_exec/pam_exec.c | 11 |
1 files changed, 3 insertions, 8 deletions
diff --git a/modules/pam_exec/pam_exec.c b/modules/pam_exec/pam_exec.c index 3fd388a5..23cc0bac 100644 --- a/modules/pam_exec/pam_exec.c +++ b/modules/pam_exec/pam_exec.c @@ -307,7 +307,7 @@ call_exec (const char *pam_type, pam_handle_t *pamh, { const char **arggv; int i; - char **envlist, **tmp; + char **envlist; int envlen, nitems; char *envstr; enum pam_modutil_redirect_fd redirect_stdin = @@ -430,14 +430,12 @@ call_exec (const char *pam_type, pam_handle_t *pamh, /* nothing */ ; nitems = PAM_ARRAY_SIZE(env_items); /* + 2 because of PAM_TYPE and NULL entry */ - tmp = realloc(envlist, (envlen + nitems + 2) * sizeof(*envlist)); - if (tmp == NULL) + envlist = realloc(envlist, (envlen + nitems + 2) * sizeof(*envlist)); + if (envlist == NULL) { - free(envlist); pam_syslog (pamh, LOG_CRIT, "realloc environment failed: %m"); _exit (ENOMEM); } - envlist = tmp; for (i = 0; i < nitems; ++i) { const void *item; @@ -446,7 +444,6 @@ call_exec (const char *pam_type, pam_handle_t *pamh, continue; if (asprintf(&envstr, "%s=%s", env_items[i].name, (const char *)item) < 0) { - free(envlist); pam_syslog (pamh, LOG_CRIT, "prepare environment failed: %m"); _exit (ENOMEM); } @@ -456,7 +453,6 @@ call_exec (const char *pam_type, pam_handle_t *pamh, if (asprintf(&envstr, "PAM_TYPE=%s", pam_type) < 0) { - free(envlist); pam_syslog (pamh, LOG_CRIT, "prepare environment failed: %m"); _exit (ENOMEM); } @@ -471,7 +467,6 @@ call_exec (const char *pam_type, pam_handle_t *pamh, DIAG_POP_IGNORE_CAST_QUAL; i = errno; pam_syslog (pamh, LOG_ERR, "execve(%s,...) failed: %m", arggv[0]); - free(envlist); _exit (i); } return PAM_SYSTEM_ERR; /* will never be reached. */ |