linux-kernel - [PATCH 4.5 059/200] crypto: rsa-pkcs1pad

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Date:	Mon,  2 May 2016 17:10:58 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Tadeusz Struk <tadeusz.struk@...el.com>,
	Herbert Xu <herbert@...dor.apana.org.au>
Subject: [PATCH 4.5 059/200] crypto: rsa-pkcs1pad - fix dst len

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

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

From: Tadeusz Struk <tadeusz.struk@...el.com>

commit 6f0904ada402a45b3a0a3b9b6507d91d3a9da67a upstream.

The output buffer length has to be at least as big as the key_size.
It is then updated to the actual output size by the implementation.

Signed-off-by: Tadeusz Struk <tadeusz.struk@...el.com>
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 crypto/rsa-pkcs1pad.c |   12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

--- a/crypto/rsa-pkcs1pad.c
+++ b/crypto/rsa-pkcs1pad.c
@@ -310,16 +310,16 @@ static int pkcs1pad_decrypt(struct akcip
 	req_ctx->child_req.src = req->src;
 	req_ctx->child_req.src_len = req->src_len;
 	req_ctx->child_req.dst = req_ctx->out_sg;
-	req_ctx->child_req.dst_len = ctx->key_size - 1;
+	req_ctx->child_req.dst_len = ctx->key_size ;
 
-	req_ctx->out_buf = kmalloc(ctx->key_size - 1,
+	req_ctx->out_buf = kmalloc(ctx->key_size,
 			(req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
 			GFP_KERNEL : GFP_ATOMIC);
 	if (!req_ctx->out_buf)
 		return -ENOMEM;
 
 	pkcs1pad_sg_set_buf(req_ctx->out_sg, req_ctx->out_buf,
-			ctx->key_size - 1, NULL);
+			    ctx->key_size, NULL);
 
 	akcipher_request_set_tfm(&req_ctx->child_req, ctx->child);
 	akcipher_request_set_callback(&req_ctx->child_req, req->base.flags,
@@ -491,16 +491,16 @@ static int pkcs1pad_verify(struct akciph
 	req_ctx->child_req.src = req->src;
 	req_ctx->child_req.src_len = req->src_len;
 	req_ctx->child_req.dst = req_ctx->out_sg;
-	req_ctx->child_req.dst_len = ctx->key_size - 1;
+	req_ctx->child_req.dst_len = ctx->key_size;
 
-	req_ctx->out_buf = kmalloc(ctx->key_size - 1,
+	req_ctx->out_buf = kmalloc(ctx->key_size,
 			(req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
 			GFP_KERNEL : GFP_ATOMIC);
 	if (!req_ctx->out_buf)
 		return -ENOMEM;
 
 	pkcs1pad_sg_set_buf(req_ctx->out_sg, req_ctx->out_buf,
-			ctx->key_size - 1, NULL);
+			    ctx->key_size, NULL);
 
 	akcipher_request_set_tfm(&req_ctx->child_req, ctx->child);
 	akcipher_request_set_callback(&req_ctx->child_req, req->base.flags,