From: Amos Kong <akong@redhat.com>
Date: Thu, 21 Nov 2013 08:42:51 +0000 (+0800)
Subject: rng-egd: offset the point when repeatedly read from the buffer
X-Git-Tag: qemu-xen-4.5.0-rc1~324^2~3
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=fbdcec5c487685b46e78f1e40a236ebf83f862fa;p=qemu-upstream-4.5-testing.git

rng-egd: offset the point when repeatedly read from the buffer

The buffer content might be read out more than once, currently
we just repeatedly read the first data block, buffer offset is
missing.

Cc: qemu-stable@nongnu.org
Signed-off-by: Amos Kong <akong@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---

diff --git a/backends/rng-egd.c b/backends/rng-egd.c
index 6f56f9e4e..25bb3b453 100644
--- a/backends/rng-egd.c
+++ b/backends/rng-egd.c
@@ -91,12 +91,14 @@ static int rng_egd_chr_can_read(void *opaque)
 static void rng_egd_chr_read(void *opaque, const uint8_t *buf, int size)
 {
     RngEgd *s = RNG_EGD(opaque);
+    size_t buf_offset = 0;
 
     while (size > 0 && s->requests) {
         RngRequest *req = s->requests->data;
         int len = MIN(size, req->size - req->offset);
 
-        memcpy(req->data + req->offset, buf, len);
+        memcpy(req->data + req->offset, buf + buf_offset, len);
+        buf_offset += len;
         req->offset += len;
         size -= len;