[PATCH 4.5 059/200] crypto: rsa-pkcs1pad - fix dst len

Greg Kroah-Hartman
2016-05-03T00:37:09Z

From: Tadeusz Struk <tadeusz.struk@intel.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@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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,