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| author | Sumit Bose <sbose@redhat.com> | 2010-12-15 14:55:27 +0100 |
|---|---|---|
| committer | Stephen Gallagher <sgallagh@redhat.com> | 2010-12-15 11:06:50 -0500 |
| commit | ad6c0f29d78f2ce5d84d5e3d80e56152eac1b9d4 (patch) | |
| tree | efbe74a53887cf6e54ae7e97e21ca357a5e50f36 /src | |
| parent | dad9075f4bbe37ecc5d1c91541534d40c5a2becd (diff) | |
| download | sssd-ad6c0f29d78f2ce5d84d5e3d80e56152eac1b9d4.tar.gz sssd-ad6c0f29d78f2ce5d84d5e3d80e56152eac1b9d4.tar.bz2 sssd-ad6c0f29d78f2ce5d84d5e3d80e56152eac1b9d4.zip | |
Fix possible memory leak in do_pam_conversation
https://fedorahosted.org/sssd/ticket/731
Diffstat (limited to 'src')
| -rw-r--r-- | src/sss_client/pam_sss.c | 44 |
1 files changed, 28 insertions, 16 deletions
diff --git a/src/sss_client/pam_sss.c b/src/sss_client/pam_sss.c index 0745dc65..539acb0b 100644 --- a/src/sss_client/pam_sss.c +++ b/src/sss_client/pam_sss.c @@ -305,7 +305,7 @@ enum { static int do_pam_conversation(pam_handle_t *pamh, const int msg_style, const char *msg, const char *reenter_msg, - char **answer) + char **_answer) { int ret; int state = SSS_PAM_CONV_STD; @@ -313,13 +313,14 @@ static int do_pam_conversation(pam_handle_t *pamh, const int msg_style, const struct pam_message *mesg[1]; struct pam_message *pam_msg; struct pam_response *resp=NULL; + char *answer = NULL; if ((msg_style == PAM_TEXT_INFO || msg_style == PAM_ERROR_MSG) && msg == NULL) return PAM_SYSTEM_ERR; if ((msg_style == PAM_PROMPT_ECHO_OFF || msg_style == PAM_PROMPT_ECHO_ON) && - (msg == NULL || answer == NULL)) return PAM_SYSTEM_ERR; + (msg == NULL || _answer == NULL)) return PAM_SYSTEM_ERR; if (msg_style == PAM_TEXT_INFO || msg_style == PAM_ERROR_MSG) { logger(pamh, LOG_INFO, "User %s message: %s", @@ -334,7 +335,8 @@ static int do_pam_conversation(pam_handle_t *pamh, const int msg_style, pam_msg = malloc(sizeof(struct pam_message)); if (pam_msg == NULL) { D(("Malloc failed.")); - return PAM_SYSTEM_ERR; + ret = PAM_SYSTEM_ERR; + goto failed; } pam_msg->msg_style = msg_style; @@ -351,48 +353,52 @@ static int do_pam_conversation(pam_handle_t *pamh, const int msg_style, free(pam_msg); if (ret != PAM_SUCCESS) { D(("Conversation failure: %s.", pam_strerror(pamh,ret))); - return ret; + goto failed; } if (msg_style == PAM_PROMPT_ECHO_OFF || msg_style == PAM_PROMPT_ECHO_ON) { if (resp == NULL) { D(("response expected, but resp==NULL")); - return PAM_SYSTEM_ERR; + ret = PAM_SYSTEM_ERR; + goto failed; } if (state == SSS_PAM_CONV_REENTER) { - if (null_strcmp(*answer, resp[0].resp) != 0) { + if (null_strcmp(answer, resp[0].resp) != 0) { logger(pamh, LOG_NOTICE, "Passwords do not match."); _pam_overwrite((void *)resp[0].resp); free(resp[0].resp); - if (*answer != NULL) { - _pam_overwrite((void *)*answer); - free(*answer); - *answer = NULL; + if (answer != NULL) { + _pam_overwrite((void *) answer); + free(answer); + answer = NULL; } ret = do_pam_conversation(pamh, PAM_ERROR_MSG, _("Passwords do not match"), NULL, NULL); if (ret != PAM_SUCCESS) { D(("do_pam_conversation failed.")); - return PAM_SYSTEM_ERR; + ret = PAM_SYSTEM_ERR; + goto failed; } - return PAM_CRED_ERR; + ret = PAM_CRED_ERR; + goto failed; } _pam_overwrite((void *)resp[0].resp); free(resp[0].resp); } else { if (resp[0].resp == NULL) { D(("Empty password")); - *answer = NULL; + answer = NULL; } else { - *answer = strndup(resp[0].resp, MAX_AUTHTOK_SIZE); + answer = strndup(resp[0].resp, MAX_AUTHTOK_SIZE); _pam_overwrite((void *)resp[0].resp); free(resp[0].resp); - if(*answer == NULL) { + if(answer == NULL) { D(("strndup failed")); - return PAM_BUF_ERR; + ret = PAM_BUF_ERR; + goto failed; } } } @@ -407,7 +413,13 @@ static int do_pam_conversation(pam_handle_t *pamh, const int msg_style, } } while (state != SSS_PAM_CONV_DONE); + *_answer = answer; return PAM_SUCCESS; + +failed: + free(answer); + return ret; + } static errno_t display_pw_reset_message(pam_handle_t *pamh, |