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>

diff --git a/crypto/rsa-pkcs1pad.c b/crypto/rsa-pkcs1pad.c
index 1cea67d43e1db25c55db64b2f805f035428faa29..ead8dc0d084e749e35733abc164f1e209aca3f6f 100644 (file)
--- 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,