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| author | James Morris <james.morris@microsoft.com> | 2019-01-17 02:41:11 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-01-23 10:09:50 +0300 |
| commit | b9f9379336425ebd0c07d454857ddbc6fe750b36 (patch) | |
| tree | 5c055471fcfd811b4264407094b9e1884426b94b /security | |
| parent | 993e65a624c038561a57cbf5d28f087005b4df86 (diff) | |
| download | linux-b9f9379336425ebd0c07d454857ddbc6fe750b36.tar.xz | |
LSM: Check for NULL cred-security on free
commit a5795fd38ee8194451ba3f281f075301a3696ce2 upstream.
From: Casey Schaufler <casey@schaufler-ca.com>
Check that the cred security blob has been set before trying
to clean it up. There is a case during credential initialization
that could result in this.
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
Acked-by: John Johansen <john.johansen@canonical.com>
Signed-off-by: James Morris <james.morris@microsoft.com>
Reported-by: syzbot+69ca07954461f189e808@syzkaller.appspotmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'security')
| -rw-r--r-- | security/security.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/security/security.c b/security/security.c index 95a1a0f52880..4fbe4e495c02 100644 --- a/security/security.c +++ b/security/security.c @@ -993,6 +993,13 @@ int security_cred_alloc_blank(struct cred *cred, gfp_t gfp) void security_cred_free(struct cred *cred) { + /* + * There is a failure case in prepare_creds() that + * may result in a call here with ->security being NULL. + */ + if (unlikely(cred->security == NULL)) + return; + call_void_hook(cred_free, cred); } |