NFC: digital: Fix potential skb leaks in NFC-DEP code

When digital_in_send_cmd() or digital_tg_send_cmd()
fail, they do not free the skb that was passed to
them so the routine that allocated the skb should
free it.  Currently, there are several routines in
the NFC-DEP code that don't do this so make them.

Reviewed-by: Thierry Escande <thierry.escande@linux.intel.com>
Tested-by: Thierry Escande <thierry.escande@linux.intel.com>
Signed-off-by: Mark A. Greer <mgreer@animalcreek.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 17 insertions, 8 deletions

diff --git a/net/nfc/digital_dep.c b/net/nfc/digital_dep.c
index b60aa35c074f..70fcce03e8a9 100644
--- a/net/nfc/digital_dep.c
+++ b/net/nfc/digital_dep.c
@@ -198,6 +198,7 @@ static int digital_in_send_psl_req(struct nfc_digital_dev *ddev,
 {
         struct sk_buff *skb;
         struct digital_psl_req *psl_req;
+        int rc;
 
         skb = digital_skb_alloc(ddev, sizeof(*psl_req));
         if (!skb)
@@ -217,8 +218,12 @@ static int digital_in_send_psl_req(struct nfc_digital_dev *ddev,
 
         ddev->skb_add_crc(skb);
 
-        return digital_in_send_cmd(ddev, skb, 500, digital_in_recv_psl_res,
-                                   target);
+        rc = digital_in_send_cmd(ddev, skb, 500, digital_in_recv_psl_res,
+                                 target);
+        if (rc)
+                kfree_skb(skb);
+
+        return rc;
 }
 
 static void digital_in_recv_atr_res(struct nfc_digital_dev *ddev, void *arg,
@@ -286,6 +291,7 @@ int digital_in_send_atr_req(struct nfc_digital_dev *ddev,
         struct sk_buff *skb;
         struct digital_atr_req *atr_req;
         uint size;
+        int rc;
 
         size = DIGITAL_ATR_REQ_MIN_SIZE + gb_len;
 
@@ -325,8 +331,12 @@ int digital_in_send_atr_req(struct nfc_digital_dev *ddev,
 
         ddev->skb_add_crc(skb);
 
-        return digital_in_send_cmd(ddev, skb, 500, digital_in_recv_atr_res,
-                                   target);
+        rc = digital_in_send_cmd(ddev, skb, 500, digital_in_recv_atr_res,
+                                 target);
+        if (rc)
+                kfree_skb(skb);
+
+        return rc;
 }
 
 static int digital_in_send_rtox(struct nfc_digital_dev *ddev,
@@ -357,6 +367,8 @@ static int digital_in_send_rtox(struct nfc_digital_dev *ddev,
 
         rc = digital_in_send_cmd(ddev, skb, 1500, digital_in_recv_dep_res,
                                  data_exch);
+        if (rc)
+                kfree_skb(skb);
 
         return rc;
 }
@@ -634,7 +646,6 @@ static int digital_tg_send_psl_res(struct nfc_digital_dev *ddev, u8 did,
 
         rc = digital_tg_send_cmd(ddev, skb, 0, digital_tg_send_psl_res_complete,
                                  (void *)(unsigned long)rf_tech);
-
         if (rc)
                 kfree_skb(skb);
 
@@ -758,10 +769,8 @@ static int digital_tg_send_atr_res(struct nfc_digital_dev *ddev,
 
         rc = digital_tg_send_cmd(ddev, skb, 999,
                                  digital_tg_send_atr_res_complete, NULL);
-        if (rc) {
+        if (rc)
                 kfree_skb(skb);
-                return rc;
-        }
 
         return rc;
 }