crypto: s390 - fix aes,des ctr mode concurrency finding.

commit 3901c1124ec5099254a9396085f7798153a7293f upstream.

An additional testcase found an issue with the last
series of patches applied: the fallback solution may
not save the iv value after operation. This very small
fix just makes sure the iv is copied back to the
walk/desc struct.

Cc: <stable@vger.kernel.org> # 3.14+
Signed-off-by: Harald Freudenberger <freude@linux.vnet.ibm.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>

diff --git a/arch/s390/crypto/aes_s390.c b/arch/s390/crypto/aes_s390.c
index f8d9cb14adce1641667de151838c5bec70d7d53d..92eb4d6ad39dcf1480621f50b22ea95c933a6d5d 100644 (file)
--- a/arch/s390/crypto/aes_s390.c
+++ b/arch/s390/crypto/aes_s390.c
@@ -818,6 +818,9 @@ static int ctr_aes_crypt(struct blkcipher_desc *desc, long func,
                else
                        memcpy(walk->iv, ctrptr, AES_BLOCK_SIZE);
                spin_unlock(&ctrblk_lock);
+       } else {
+               if (!nbytes)
+                       memcpy(walk->iv, ctrptr, AES_BLOCK_SIZE);
        }
        /*
         * final block may be < AES_BLOCK_SIZE, copy only nbytes

diff --git a/arch/s390/crypto/des_s390.c b/arch/s390/crypto/des_s390.c
index a3e24d4d2530b23924b274e4d799e981af22a065..a89feffb22b5283845ed8beedf0531e86be95796 100644 (file)
--- a/arch/s390/crypto/des_s390.c
+++ b/arch/s390/crypto/des_s390.c
@@ -429,6 +429,9 @@ static int ctr_desall_crypt(struct blkcipher_desc *desc, long func,
                else
                        memcpy(walk->iv, ctrptr, DES_BLOCK_SIZE);
                spin_unlock(&ctrblk_lock);
+       } else {
+               if (!nbytes)
+                       memcpy(walk->iv, ctrptr, DES_BLOCK_SIZE);
        }
        /* final block may be < DES_BLOCK_SIZE, copy only nbytes */
        if (nbytes) {