[gimp] libgimpbase: read up to 255 bytes into a 256 bytes buffer.

[Jehan <jehanp src gnome org>]

commit 7c99fa02f9f1ac7d2dff2dc4f496ccbc715526df
Author: Jehan <jehan girinstud io>
Date:   Thu Nov 25 09:53:00 2021 +0100

    libgimpbase: read up to 255 bytes into a 256 bytes buffer.
    
    Otherwise if we add a NUL byte after the last byte, we might right past
    the allocated memory. Thanks to Massimo for reporting this error raised
    by Address Sanitizer and valgrind (cf. #7539).

 libgimpbase/gimputils.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/libgimpbase/gimputils.c b/libgimpbase/gimputils.c
index 03892e030e..1b07acee57 100644
--- a/libgimpbase/gimputils.c
+++ b/libgimpbase/gimputils.c
@@ -1342,7 +1342,7 @@ gimp_stack_trace_print (const gchar   *prog_name,
        */
       close (out_fd[1]);
 
-      while ((read_n = read (out_fd[0], buffer, 256)) != 0)
+      while ((read_n = read (out_fd[0], buffer, 255)) != 0)
         {
           if (read_n < 0)
             {