crypto: marvell/octeontx - Fix a potential NULL dereference

Smatch reports that:

    drivers/crypto/marvell/octeontx/otx_cptvf_algs.c:132 otx_cpt_aead_callback()
    warn: variable dereferenced before check 'cpt_info' (see line 121)

This function is called from process_pending_queue() as:

drivers/crypto/marvell/octeontx/otx_cptvf_reqmgr.c
   599                  /*
   600                   * Call callback after current pending entry has been
   601                   * processed, we don't do it if the callback pointer is
   602                   * invalid.
   603                   */
   604                  if (callback)
   605                          callback(res_code, areq, cpt_info);

It does appear to me that "cpt_info" can be NULL so this could lead to
a NULL dereference.

Fixes: 10b4f09491bf ("crypto: marvell - add the Virtual Function driver for CPT")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/drivers/crypto/marvell/octeontx/otx_cptvf_algs.c b/drivers/crypto/marvell/octeontx/otx_cptvf_algs.c
index 60e744f..1e0a1d7 100644 (file)
--- a/drivers/crypto/marvell/octeontx/otx_cptvf_algs.c
+++ b/drivers/crypto/marvell/octeontx/otx_cptvf_algs.c
@@ -118,6 +118,9 @@ static void otx_cpt_aead_callback(int status, void *arg1, void *arg2)
        struct otx_cpt_req_info *cpt_req;
        struct pci_dev *pdev;
 
+       if (!cpt_info)
+               goto complete;
+
        cpt_req = cpt_info->req;
        if (!status) {
                /*
@@ -129,10 +132,10 @@ static void otx_cpt_aead_callback(int status, void *arg1, void *arg2)
                    !cpt_req->is_enc)
                        status = validate_hmac_cipher_null(cpt_req);
        }
-       if (cpt_info) {
-               pdev = cpt_info->pdev;
-               do_request_cleanup(pdev, cpt_info);
-       }
+       pdev = cpt_info->pdev;
+       do_request_cleanup(pdev, cpt_info);
+
+complete:
        if (areq)
                areq->complete(areq, status);
 }