Bug#22828 _my_b_read() ignores return values for my_seek() calls

- Because my_seek actually is capable of returning an error code we should
  exploit that in the best possible way.
- There might be kernel errors or other errors we can't predict and capturing
  the return value of all system calls gives us better understanding of
  possible errors.

1 files changed, 5 insertions, 1 deletions

diff --git a/mysys/my_chsize.c b/mysys/my_chsize.c
index cf26428d65f..b925b52ac03 100644
--- a/mysys/my_chsize.c
+++ b/mysys/my_chsize.c
@@ -88,7 +88,11 @@ int my_chsize(File fd, my_off_t newlength, int filler, myf MyFlags)
       Fill space between requested length and true length with 'filler'
       We should never come here on any modern machine
     */
-    VOID(my_seek(fd, newlength, MY_SEEK_SET, MYF(MY_WME+MY_FAE)));
+    if (my_seek(fd, newlength, MY_SEEK_SET, MYF(MY_WME+MY_FAE))
+        == MY_FILEPOS_ERROR)
+    {
+      goto err;
+    }
     swap_variables(my_off_t, newlength, oldsize);
   }
 #endif