libceph: fix crypto key null deref, memory leak

Avoid crashing if the crypto key payload was NULL, as when it was not correctly
allocated and initialized.  Also, avoid leaking it.

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
Signed-off-by: Sage Weil <sage@inktank.com>
Reviewed-by: Alex Elder <elder@inktank.com>

2 files changed, 3 insertions, 1 deletions

diff --git a/net/ceph/crypto.c b/net/ceph/crypto.c
index b780cb7947dd..9da7fdd3cd8a 100644
--- a/net/ceph/crypto.c
+++ b/net/ceph/crypto.c
@@ -466,6 +466,7 @@ void ceph_key_destroy(struct key *key) {
         struct ceph_crypto_key *ckey = key->payload.data;
 
         ceph_crypto_key_destroy(ckey);
+        kfree(ckey);
 }
 
 struct key_type key_type_ceph = {
diff --git a/net/ceph/crypto.h b/net/ceph/crypto.h
index 1919d1550d75..3572dc518bc9 100644
--- a/net/ceph/crypto.h
+++ b/net/ceph/crypto.h
@@ -16,7 +16,8 @@ struct ceph_crypto_key {
 
 static inline void ceph_crypto_key_destroy(struct ceph_crypto_key *key)
 {
-        kfree(key->key);
+        if (key)
+                kfree(key->key);
 }
 
 extern int ceph_crypto_key_clone(struct ceph_crypto_key *dst,