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[PULL 1/5] nbd: Avoid off-by-one in long export name truncation

From: Eric Blake
Subject: [PULL 1/5] nbd: Avoid off-by-one in long export name truncation
Date: Mon, 13 Jul 2020 09:21:02 -0500

When snprintf returns the same value as the buffer size, the final
byte was truncated to ensure a NUL terminator.  Fortunately, such long
export names are unusual enough, with no real impact other than what
is displayed to the user.

Fixes: 5c86bdf12089
Reported-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <20200622210355.414941-1-eblake@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
 block/nbd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/block/nbd.c b/block/nbd.c
index c297336ffc5f..65a4f56924ec 100644
--- a/block/nbd.c
+++ b/block/nbd.c
@@ -2002,7 +2002,7 @@ static void nbd_refresh_filename(BlockDriverState *bs)
         len = snprintf(bs->exact_filename, sizeof(bs->exact_filename),
                        "nbd://%s:%s", host, port);
-    if (len > sizeof(bs->exact_filename)) {
+    if (len >= sizeof(bs->exact_filename)) {
         /* Name is too long to represent exactly, so leave it empty. */
         bs->exact_filename[0] = '\0';

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