crypto: rsa-pkcs1pad - fix dst len

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.

Cc: <stable@vger.kernel.org>
Signed-off-by: Tadeusz Struk <tadeusz.struk@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 6 insertions, 6 deletions

diff --git a/crypto/rsa-pkcs1pad.c b/crypto/rsa-pkcs1pad.c
index 1cea67d43e1d..ead8dc0d084e 100644
--- a/crypto/rsa-pkcs1pad.c
+++ b/crypto/rsa-pkcs1pad.c
@@ -387,16 +387,16 @@ static int pkcs1pad_decrypt(struct akcipher_request *req)
         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,
@@ -595,16 +595,16 @@ static int pkcs1pad_verify(struct akcipher_request *req)
         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,