[Qemu-stable] [PATCH 32/32] rng-egd: offset the point when repeatedly read from the buffer

[Michael Roth]

From: Amos Kong <address@hidden>

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

Cc: address@hidden
Signed-off-by: Amos Kong <address@hidden>
Message-id: address@hidden
Signed-off-by: Anthony Liguori <address@hidden>
(cherry picked from commit 1eb1bd9eafa890f1f4d16ef5cb8b9239a86874d9)

Signed-off-by: Michael Roth <address@hidden>
---
 backends/rng-egd.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/backends/rng-egd.c b/backends/rng-egd.c
index 9e5a536..2962795 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;
 
-- 
1.7.9.5