[Qemu-devel] [PATCH 28/43] block: Fix regression for MinGW (assertion caused by short string)

[Michael Roth]

From: Stefan Weil <address@hidden>

The local string tmp_filename is passed to function get_tmp_filename
which expects a string with minimum size MAX_PATH for w32 hosts.

MAX_PATH is 260 and PATH_MAX is 259, so tmp_filename was too short.

Commit eba25057b9a5e19d10ace2bc7716667a31297169 introduced this
regression.

Signed-off-by: Stefan Weil <address@hidden>
Reviewed-by: Stefan Hajnoczi <address@hidden>
Signed-off-by: Blue Swirl <address@hidden>
(cherry picked from commit 89c9bc3d147fdaa932db99b0463b4af1d3e7cda1)

Signed-off-by: Michael Roth <address@hidden>
---
 block.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/block.c b/block.c
index 4c0e7f5..e49a999 100644
--- a/block.c
+++ b/block.c
@@ -739,7 +739,8 @@ int bdrv_open(BlockDriverState *bs, const char *filename, 
int flags,
               BlockDriver *drv)
 {
     int ret;
-    char tmp_filename[PATH_MAX];
+    /* TODO: extra byte is a hack to ensure MAX_PATH space on Windows. */
+    char tmp_filename[PATH_MAX + 1];
 
     if (flags & BDRV_O_SNAPSHOT) {
         BlockDriverState *bs1;
-- 
1.7.9.5