fw_env: Add missing write failure check

If flash_write fails, whilst we propagate this up to our caller, we need
to avoid swapping in the new file (if we're on a filesystem) in this
case.

Fixes: dbc34323796b ("tools: env: Implement atomic replace for filesystem")
Signed-off-by: Alex Kiernan <alex.kiernan@gmail.com>

diff --git a/tools/env/fw_env.c b/tools/env/fw_env.c
index cfada0e..eef12dd 100644 (file)
--- a/tools/env/fw_env.c
+++ b/tools/env/fw_env.c
@@ -1317,7 +1317,7 @@ static int flash_io_write(int fd_current)
                        rc = -1;
                }
 
-               if (target_temp) {
+               if (rc >= 0 && target_temp) {
                        int dir_fd;
 
                        dir_fd = open(dname, O_DIRECTORY | O_RDONLY);