From dadc0c1bbccad48022e400debc3341597a0f2cf5 Mon Sep 17 00:00:00 2001
From: Herbert Xu <herbert.xu@redhat.com>
Date: Thu, 30 Apr 2026 19:56:24 +0800
Subject: [PATCH] crypto: authencesn - Fix src offset when decrypting in-place

JIRA: https://redhat.atlassian.net/browse/RHEL-172216

Upstream Status: 1f48ad3b19a9dfc947868edda0bb8e48e5b5a8fa

commit 1f48ad3b19a9dfc947868edda0bb8e48e5b5a8fa
Author: Herbert Xu <herbert@gondor.apana.org.au>
Date:   Wed Apr 15 07:39:06 2026 +0800

    crypto: authencesn - Fix src offset when decrypting in-place

    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: Herbert Xu <herbert.xu@redhat.com>

diff --git a/crypto/authencesn.c b/crypto/authencesn.c
index b262e7e3f8d7..d96da934674e 100644
--- a/crypto/authencesn.c
+++ b/crypto/authencesn.c
@@ -259,9 +259,11 @@ static int crypto_authenc_esn_decrypt_tail(struct aead_request *req,
 
 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,
-- 
2.50.1 (Apple Git-155)