os/filestore: fix valgrind warning on fsid read

Signed-off-by: Sage Weil <sage@redhat.com>

diff --git a/src/os/filestore/FileStore.cc b/src/os/filestore/FileStore.cc
index de2df61a0c4cf6a98fe3509429728c503c27b663..c1bfdc3479b4b23268464cc6ad0e4a2e1dedeaac 100644 (file)
--- a/src/os/filestore/FileStore.cc
+++ b/src/os/filestore/FileStore.cc
@@ -978,6 +978,7 @@ int FileStore::mkjournal()
 int FileStore::read_fsid(int fd, uuid_d *uuid)
 {
   char fsid_str[40];
+  memset(fsid_str, 0, sizeof(fsid_str));
   int ret = safe_read(fd, fsid_str, sizeof(fsid_str));
   if (ret < 0)
     return ret;