[PATCH 7.0 01/42] crypto: authencesn - Fix src offset when decrypting in-place

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

7.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Herbert Xu <herbert@gondor.apana.org.au>

commit 1f48ad3b19a9dfc947868edda0bb8e48e5b5a8fa upstream.

The src SG list offset wasn't set properly when decrypting in-place,
fix it.

Reported-by: Wolfgang Walter <linux@stwm.de>
Fixes: e02494114ebf ("crypto: authencesn - Do not place hiseq at end of dst for out-of-place decryption")
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 crypto/authencesn.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/crypto/authencesn.c
+++ b/crypto/authencesn.c
@@ -228,9 +228,11 @@ static int crypto_authenc_esn_decrypt_ta
 
 decrypt:
 
-	if (src != dst)
-		src = scatterwalk_ffwd(areq_ctx->src, src, assoclen);
 	dst = scatterwalk_ffwd(areq_ctx->dst, dst, assoclen);
+	if (req->src == req->dst)
+		src = dst;
+	else
+		src = scatterwalk_ffwd(areq_ctx->src, src, assoclen);
 
 	skcipher_request_set_tfm(skreq, ctx->enc);
 	skcipher_request_set_callback(skreq, flags,