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| author |   James Morris <james.morris@microsoft.com> | 2019-01-16 15:41:11 -0800 |
|---|---|---|
| committer | James Morris <james.morris@microsoft.com> | 2019-01-16 15:41:11 -0800 |
| commit | a5795fd38ee8194451ba3f281f075301a3696ce2 (patch) | |
| tree | e1081bd211b1ea0857073db96b05d65e896012ac | |
| parent | Yama: Check for pid death before checking ancestry (diff) | |
| download | linux-dev-a5795fd38ee8194451ba3f281f075301a3696ce2.tar.xz linux-dev-a5795fd38ee8194451ba3f281f075301a3696ce2.zip | |
LSM: Check for NULL cred-security on free
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
| -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 f1b8d2587639..55bc49027ba9 100644 --- a/security/security.c +++ b/security/security.c @@ -1027,6 +1027,13 @@ 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); } |