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-rw-r--r--block/nbd.c21
1 files changed, 13 insertions, 8 deletions
diff --git a/block/nbd.c b/block/nbd.c
index 4ac23c8f62..eed160c5cd 100644
--- a/block/nbd.c
+++ b/block/nbd.c
@@ -1984,6 +1984,7 @@ static void nbd_refresh_filename(BlockDriverState *bs)
{
BDRVNBDState *s = bs->opaque;
const char *host = NULL, *port = NULL, *path = NULL;
+ size_t len = 0;
if (s->saddr->type == SOCKET_ADDRESS_TYPE_INET) {
const InetSocketAddress *inet = &s->saddr->u.inet;
@@ -1996,17 +1997,21 @@ static void nbd_refresh_filename(BlockDriverState *bs)
} /* else can't represent as pseudo-filename */
if (path && s->export) {
- snprintf(bs->exact_filename, sizeof(bs->exact_filename),
- "nbd+unix:///%s?socket=%s", s->export, path);
+ len = snprintf(bs->exact_filename, sizeof(bs->exact_filename),
+ "nbd+unix:///%s?socket=%s", s->export, path);
} else if (path && !s->export) {
- snprintf(bs->exact_filename, sizeof(bs->exact_filename),
- "nbd+unix://?socket=%s", path);
+ len = snprintf(bs->exact_filename, sizeof(bs->exact_filename),
+ "nbd+unix://?socket=%s", path);
} else if (host && s->export) {
- snprintf(bs->exact_filename, sizeof(bs->exact_filename),
- "nbd://%s:%s/%s", host, port, s->export);
+ len = snprintf(bs->exact_filename, sizeof(bs->exact_filename),
+ "nbd://%s:%s/%s", host, port, s->export);
} else if (host && !s->export) {
- snprintf(bs->exact_filename, sizeof(bs->exact_filename),
- "nbd://%s:%s", host, port);
+ len = snprintf(bs->exact_filename, sizeof(bs->exact_filename),
+ "nbd://%s:%s", host, port);
+ }
+ if (len > sizeof(bs->exact_filename)) {
+ /* Name is too long to represent exactly, so leave it empty. */
+ bs->exact_filename[0] = '\0';
}
}