1.1 --- a/xen/common/xencomm.c	Fri Jan 12 14:50:01 2007 +0000
     1.2 +++ b/xen/common/xencomm.c	Fri Jan 12 14:51:27 2007 +0000
     1.3 @@ -119,7 +119,7 @@ xencomm_copy_from_guest(void *to, const 
     1.4          chunksz -= chunk_skip;
     1.5          skip -= chunk_skip;
     1.6  
     1.7 -        if (skip == 0) {
     1.8 +        if (skip == 0 && chunksz > 0) {
     1.9              unsigned long src_maddr;
    1.10              unsigned long dest = (unsigned long)to + to_pos;
    1.11              unsigned int bytes = min(chunksz, n - to_pos);
    1.12 @@ -225,7 +225,7 @@ xencomm_copy_to_guest(void *to, const vo
    1.13          chunksz -= chunk_skip;
    1.14          skip -= chunk_skip;
    1.15  
    1.16 -        if (skip == 0) {
    1.17 +        if (skip == 0 && chunksz > 0) {
    1.18              unsigned long dest_maddr;
    1.19              unsigned long source = (unsigned long)from + from_pos;
    1.20              unsigned int bytes = min(chunksz, n - from_pos);