From e1bfb1234b6cf5527afe3db762c3a64023adf547 Mon Sep 17 00:00:00 2001
From: Geoffrey McRae <geoff@hostfission.com>
Date: Mon, 14 Oct 2019 18:08:06 +1100
Subject: [PATCH] [common] obey the destination buffer size

---
 VERSION                  |  2 +-
 common/src/framebuffer.c | 14 +++++++++++---
 2 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/VERSION b/VERSION
index 038843f1..05aa7aac 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-B1-11-g5f1d17ba1f+1
\ No newline at end of file
+B1-12-g9377fdfc37+1
\ No newline at end of file
diff --git a/common/src/framebuffer.c b/common/src/framebuffer.c
index 7dbbb258..d25f6930 100644
--- a/common/src/framebuffer.c
+++ b/common/src/framebuffer.c
@@ -40,9 +40,13 @@ bool framebuffer_read(const FrameBuffer frame, void * dst, size_t size)
 
     /* copy what we can */
     uint64_t avail = frame->wp - rp;
+    avail = avail > size ? size : avail;
+
     memcpy(d, frame->data + rp, avail);
-    rp += avail;
-    d  += avail;
+
+    rp   += avail;
+    d    += avail;
+    size -= avail;
   }
   return true;
 }
@@ -57,9 +61,13 @@ bool framebuffer_read_fn(const FrameBuffer frame, FrameBufferReadFn fn, size_t s
 
     /* copy what we can */
     uint64_t avail = frame->wp - rp;
+    avail = avail > size ? size : avail;
+
     if (!fn(opaque, frame->data + rp, avail))
       return false;
-    rp += avail;
+
+    rp   += avail;
+    size -= avail;
   }
 
   return true;