[Qemu-devel] [PATCH 6/7] Fix zero-length write(2).

[Richard Henderson]

Signed-off-by: Richard Henderson <address@hidden>
---
 exec.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/exec.c b/exec.c
index 33854e1..d69194c 100644
--- a/exec.c
+++ b/exec.c
@@ -2461,6 +2461,9 @@ int page_check_range(target_ulong start, target_ulong 
len, int flags)
     assert(start < ((abi_ulong)1 << L1_MAP_ADDR_SPACE_BITS));
 #endif
 
+    if (len == 0) {
+        return 0;
+    }
     if (start + len - 1 < start) {
         /* We've wrapped around.  */
         return -1;
-- 
1.6.6.1