From: Herbert Xu <herbert@gondor.apana.org.au>
Date: Thu, 30 Apr 2026 06:27:29 +0000 (-0700)
Subject: crypto: authencesn - Fix src offset when decrypting in-place
X-Git-Tag: v6.1.170~5
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=b5ac2c209ec71df33bdc9eb7b4c22a833d18faae;p=thirdparty%2Fkernel%2Fstable.git

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

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: Eric Biggers <ebiggers@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/crypto/authencesn.c b/crypto/authencesn.c
index 5dc057cb0cdf1..2154d4ab5c952 100644
--- a/crypto/authencesn.c
+++ b/crypto/authencesn.c
@@ -235,9 +235,11 @@ 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,