fabrics: check the read() return value

Do not pass to the is_dmi_uuid_valid() function an invalid len value
if read() fails.

Signed-off-by: Maurizio Lombardi <mlombard@redhat.com>

diff --git a/src/nvme/fabrics.c b/src/nvme/fabrics.c
index 1f50229f0e7ba8a8aedabe216740acff9822bdec..ac639bdfd3b9581de253384f51664df9defb63ff 100644 (file)
--- a/src/nvme/fabrics.c
+++ b/src/nvme/fabrics.c
@@ -1297,6 +1297,8 @@ static int uuid_from_dmi_entries(char *system_uuid)
                        continue;
                len = read(f, buf, 512);
                close(f);
+               if (len <= 0)
+                       continue;
 
                if (!is_dmi_uuid_valid(buf, len))
                        continue;