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[PATCH] nbd: Avoid off-by-one in long export name truncation
From: |
Eric Blake |
Subject: |
[PATCH] nbd: Avoid off-by-one in long export name truncation |
Date: |
Mon, 22 Jun 2020 16:03:55 -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>
---
block/nbd.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/block/nbd.c b/block/nbd.c
index eed160c5cda1..8301fcac0589 100644
--- a/block/nbd.c
+++ b/block/nbd.c
@@ -2009,7 +2009,7 @@ 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';
}
--
2.27.0
- [PATCH] nbd: Avoid off-by-one in long export name truncation,
Eric Blake <=