[PATCH] chtls: fix null dereference chtls_free_uld()

[Ganesh Goudar]

call chtls_free_uld() only for the initialized cdev,
this fixes NULL dereference in chtls_free_uld()

Signed-off-by: Ganesh Goudar <ganes...@chelsio.com>
Signed-off-by: Atul Gupta <atul.gu...@chelsio.com>
---
 drivers/crypto/chelsio/chtls/chtls.h      | 5 +++++
 drivers/crypto/chelsio/chtls/chtls_main.c | 7 +++++--
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/crypto/chelsio/chtls/chtls.h 
b/drivers/crypto/chelsio/chtls/chtls.h
index a53a0e6..7725b6e 100644
--- a/drivers/crypto/chelsio/chtls/chtls.h
+++ b/drivers/crypto/chelsio/chtls/chtls.h
@@ -96,6 +96,10 @@ enum csk_flags {
        CSK_CONN_INLINE,        /* Connection on HW */
 };
 
+enum chtls_cdev_state {
+       CHTLS_CDEV_STATE_UP = 1
+};
+
 struct listen_ctx {
        struct sock *lsk;
        struct chtls_dev *cdev;
@@ -146,6 +150,7 @@ struct chtls_dev {
        unsigned int send_page_order;
        int max_host_sndbuf;
        struct key_map kmap;
+       unsigned int cdev_state;
 };
 
 struct chtls_hws {
diff --git a/drivers/crypto/chelsio/chtls/chtls_main.c 
b/drivers/crypto/chelsio/chtls/chtls_main.c
index 9b07f91..f59b044 100644
--- a/drivers/crypto/chelsio/chtls/chtls_main.c
+++ b/drivers/crypto/chelsio/chtls/chtls_main.c
@@ -160,6 +160,7 @@ static void chtls_register_dev(struct chtls_dev *cdev)
        tlsdev->hash = chtls_create_hash;
        tlsdev->unhash = chtls_destroy_hash;
        tls_register_device(&cdev->tlsdev);
+       cdev->cdev_state = CHTLS_CDEV_STATE_UP;
 }
 
 static void chtls_unregister_dev(struct chtls_dev *cdev)
@@ -281,8 +282,10 @@ static void chtls_free_all_uld(void)
        struct chtls_dev *cdev, *tmp;
 
        mutex_lock(&cdev_mutex);
-       list_for_each_entry_safe(cdev, tmp, &cdev_list, list)
-               chtls_free_uld(cdev);
+       list_for_each_entry_safe(cdev, tmp, &cdev_list, list) {
+               if (cdev->cdev_state == CHTLS_CDEV_STATE_UP)
+                       chtls_free_uld(cdev);
+       }
        mutex_unlock(&cdev_mutex);
 }
 
-- 
2.1.0