crypto: aead - Preserve in-place processing in old_crypt

This patch tries to preserve in-place processing in old_crypt as various algorithms are optimised for in-place processing where src == dst. Signed-off-by: Herbert Xu <[email protected]>
josf · May 28, 2015 · b455eb8 · b455eb8
1 parent fdaef75
commit b455eb8
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/crypto/aead.c b/crypto/aead.c
@@ -107,7 +107,8 @@ static int old_crypt(struct aead_request *req,
 		return crypt(req);
 
 	src = scatterwalk_ffwd(nreq->srcbuf, req->src, req->assoclen);
-	dst = scatterwalk_ffwd(nreq->dstbuf, req->dst, req->assoclen);
+	dst = req->src == req->dst ?
+	      src : scatterwalk_ffwd(nreq->dstbuf, req->dst, req->assoclen);
 
 	aead_request_set_tfm(&nreq->subreq, aead);
 	aead_request_set_callback(&nreq->subreq, aead_request_flags(req),