diff options
| author | Eric Blake <eblake@redhat.com> | 2020-06-22 16:03:55 -0500 |
|---|---|---|
| committer | Eric Blake <eblake@redhat.com> | 2020-07-13 09:01:01 -0500 |
| commit | 00d69986da83a74f6f5731c80f8dd09fde95d19a (patch) | |
| tree | 3a8c5766dd57a2e858cb930542f9044bfd6378f9 /block/nbd.c | |
| parent | 00ce6c36b35e0eb8cc5d68a28f288a6335848813 (diff) | |
nbd: Avoid off-by-one in long export name truncation
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>
Diffstat (limited to 'block/nbd.c')
| -rw-r--r-- | block/nbd.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/block/nbd.c b/block/nbd.c index c297336ffc..65a4f56924 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'; } |