use the return code from lseek() to detect problems and bail out if so

diff --git a/lib/file.c b/lib/file.c
index e9ed5b7f0d7885704442ff29efdb9cd336b7492f..602299d010135b41894b7e4b820ce62ae3d1c0ed 100644 (file)
--- a/lib/file.c
+++ b/lib/file.c
@@ -367,8 +367,11 @@ CURLcode Curl_file(struct connectdata *conn, bool *done)
   if(fstated)
     Curl_pgrsSetDownloadSize(data, expected_size);
 
-  if(data->reqdata.resume_from)
-    lseek(fd, data->reqdata.resume_from, SEEK_SET);
+  if(data->reqdata.resume_from) {
+    if(data->reqdata.resume_from !=
+       lseek(fd, data->reqdata.resume_from, SEEK_SET))
+      return CURLE_BAD_DOWNLOAD_RESUME;
+  }
 
   Curl_pgrsTime(data, TIMER_STARTTRANSFER);