From patchwork Mon Mar 29 17:54:42 2010
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Subject: [6/7] Fix zero-length write(2).
From: Richard Henderson <rth@twiddle.net>
X-Patchwork-Id: 49415
Message-Id: <259b99693dc30d50fec822d4b3356c7082ad0c12.1270488612.git.rth@twiddle.net>
To: qemu-devel@nongnu.org
Cc: blauwirbel@gmail.com
Date: Mon, 29 Mar 2010 10:54:42 -0700

Signed-off-by: Richard Henderson <rth@twiddle.net>

---
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;