diff options
| author | Daniel Abrecht <daniel.abrecht@hotmail.com> | 2017-01-19 11:35:04 +0100 |
|---|---|---|
| committer | Dmitry V. Levin <ldv@altlinux.org> | 2017-01-19 10:35:04 +0000 |
| commit | c8dc2b4c2045bb44a038356751e0f0428afe1171 (patch) | |
| tree | 1952cb3947dc9428c84c68111dc2b033d2143dfa /modules/pam_exec/pam_exec.c | |
| parent | dbd1ae9516e2ff9793cf8957111d526a90716862 (diff) | |
pam_exec: fix a potential null pointer dereference
Fix a null pointer dereference when pam_prompt returns PAM_SUCCESS
but the response is set to NULL.
* modules/pam_exec/pam_exec.c (call_exec): Do not invoke strndupa
with a null pointer.
Closes: https://github.com/linux-pam/linux-pam/pull/2
Diffstat (limited to 'modules/pam_exec/pam_exec.c')
| -rw-r--r-- | modules/pam_exec/pam_exec.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/modules/pam_exec/pam_exec.c b/modules/pam_exec/pam_exec.c index f7de1aa5..52dc6818 100644 --- a/modules/pam_exec/pam_exec.c +++ b/modules/pam_exec/pam_exec.c @@ -177,9 +177,12 @@ call_exec (const char *pam_type, pam_handle_t *pamh, return retval; } - pam_set_item (pamh, PAM_AUTHTOK, resp); - authtok = strndupa (resp, PAM_MAX_RESP_SIZE); - _pam_drop (resp); + if (resp) + { + pam_set_item (pamh, PAM_AUTHTOK, resp); + authtok = strndupa (resp, PAM_MAX_RESP_SIZE); + _pam_drop (resp); + } } else authtok = strndupa (void_pass, PAM_MAX_RESP_SIZE); |