[Xen-changelog] [xen-unstable] [IA64] Fix calling xencomm_copy_chunk_{to, from} with len = 0

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User awilliam@xxxxxxxxxxxx
# Date 1167952225 25200
# Node ID eb40e07b867f9708a9c39225ce1591e19808852a
# Parent  2d4807ed105677e6039abcd1877ec5fa2803f403
[IA64] Fix calling xencomm_copy_chunk_{to, from} with len = 0

Originally debugged by Kazuhiro Suzuki

Signed-off-by: Isaku Yamahata <yamahata@xxxxxxxxxxxxx>
---
 xen/arch/ia64/xen/xencomm.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff -r 2d4807ed1056 -r eb40e07b867f xen/arch/ia64/xen/xencomm.c
--- a/xen/arch/ia64/xen/xencomm.c       Thu Jan 04 16:00:56 2007 -0700
+++ b/xen/arch/ia64/xen/xencomm.c       Thu Jan 04 16:10:25 2007 -0700
@@ -153,7 +153,7 @@ xencomm_copy_from_guest(
         chunksz -= chunk_skip;
         skip -= chunk_skip;
 
-        if (skip == 0) {
+        if (skip == 0 && chunksz > 0) {
             unsigned int bytes = min(chunksz, n - to_pos);
            int res;
 
@@ -295,7 +295,7 @@ xencomm_copy_to_guest(
         skip -= chunk_skip;
         dest_paddr += chunk_skip;
 
-        if (skip == 0) {
+        if (skip == 0 && chunksz > 0) {
             unsigned int bytes = min(chunksz, n - from_pos);
             int res;
 

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