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 <[email protected]>
Fixes: e024941 ("crypto: authencesn - Do not place hiseq at end of dst for out-of-place decryption")
Signed-off-by: Herbert Xu <[email protected]>

Author: herbertx

crypto/authencesn.c

@@ -228,9 +228,11 @@ 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,