Patch "crypto: sahara - remove FLAGS_NEW_KEY logic" has been added to the 5.15-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    crypto: sahara - remove FLAGS_NEW_KEY logic

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     crypto-sahara-remove-flags_new_key-logic.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit d161bdfa1c1c88bfa586638b1beb73d802053656
Author: Ovidiu Panait <ovidiu.panait@xxxxxxxxxxxxx>
Date:   Fri Dec 1 19:06:19 2023 +0200

    crypto: sahara - remove FLAGS_NEW_KEY logic
    
    [ Upstream commit 8fd183435728b139248a77978ea3732039341779 ]
    
    Remove the FLAGS_NEW_KEY logic as it has the following issues:
    - the wrong key may end up being used when there are multiple data streams:
           t1            t2
        setkey()
        encrypt()
                       setkey()
                       encrypt()
    
        encrypt() <--- key from t2 is used
    - switching between encryption and decryption with the same key is not
      possible, as the hdr flags are only updated when a new setkey() is
      performed
    
    With this change, the key is always sent along with the cryptdata when
    performing encryption/decryption operations.
    
    Fixes: 5de8875281e1 ("crypto: sahara - Add driver for SAHARA2 accelerator.")
    Signed-off-by: Ovidiu Panait <ovidiu.panait@xxxxxxxxxxxxx>
    Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/crypto/sahara.c b/drivers/crypto/sahara.c
index b07ae4ba165e..84a7c4de537a 100644
--- a/drivers/crypto/sahara.c
+++ b/drivers/crypto/sahara.c
@@ -44,7 +44,6 @@
 #define FLAGS_MODE_MASK		0x000f
 #define FLAGS_ENCRYPT		BIT(0)
 #define FLAGS_CBC		BIT(1)
-#define FLAGS_NEW_KEY		BIT(3)
 
 #define SAHARA_HDR_BASE			0x00800000
 #define SAHARA_HDR_SKHA_ALG_AES	0
@@ -142,8 +141,6 @@ struct sahara_hw_link {
 };
 
 struct sahara_ctx {
-	unsigned long flags;
-
 	/* AES-specific context */
 	int keylen;
 	u8 key[AES_KEYSIZE_128];
@@ -448,26 +445,22 @@ static int sahara_hw_descriptor_create(struct sahara_dev *dev)
 	int i, j;
 	int idx = 0;
 
-	/* Copy new key if necessary */
-	if (ctx->flags & FLAGS_NEW_KEY) {
-		memcpy(dev->key_base, ctx->key, ctx->keylen);
-		ctx->flags &= ~FLAGS_NEW_KEY;
+	memcpy(dev->key_base, ctx->key, ctx->keylen);
 
-		if (dev->flags & FLAGS_CBC) {
-			dev->hw_desc[idx]->len1 = AES_BLOCK_SIZE;
-			dev->hw_desc[idx]->p1 = dev->iv_phys_base;
-		} else {
-			dev->hw_desc[idx]->len1 = 0;
-			dev->hw_desc[idx]->p1 = 0;
-		}
-		dev->hw_desc[idx]->len2 = ctx->keylen;
-		dev->hw_desc[idx]->p2 = dev->key_phys_base;
-		dev->hw_desc[idx]->next = dev->hw_phys_desc[1];
+	if (dev->flags & FLAGS_CBC) {
+		dev->hw_desc[idx]->len1 = AES_BLOCK_SIZE;
+		dev->hw_desc[idx]->p1 = dev->iv_phys_base;
+	} else {
+		dev->hw_desc[idx]->len1 = 0;
+		dev->hw_desc[idx]->p1 = 0;
+	}
+	dev->hw_desc[idx]->len2 = ctx->keylen;
+	dev->hw_desc[idx]->p2 = dev->key_phys_base;
+	dev->hw_desc[idx]->next = dev->hw_phys_desc[1];
+	dev->hw_desc[idx]->hdr = sahara_aes_key_hdr(dev);
 
-		dev->hw_desc[idx]->hdr = sahara_aes_key_hdr(dev);
+	idx++;
 
-		idx++;
-	}
 
 	dev->nb_in_sg = sg_nents_for_len(dev->in_sg, dev->total);
 	if (dev->nb_in_sg < 0) {
@@ -609,7 +602,6 @@ static int sahara_aes_setkey(struct crypto_skcipher *tfm, const u8 *key,
 	/* SAHARA only supports 128bit keys */
 	if (keylen == AES_KEYSIZE_128) {
 		memcpy(ctx->key, key, keylen);
-		ctx->flags |= FLAGS_NEW_KEY;
 		return 0;
 	}