[evolution-data-server] camel: Avoid an unlikely division by zero failure

[Philip Withnall <pwithnall src gnome org>]

commit f73bc5b0fda7c6063f41ffd5d3d3cb492578f9a7
Author: Philip Withnall <philip withnall collabora co uk>
Date:   Mon May 19 14:39:19 2014 +0100

    camel: Avoid an unlikely division by zero failure
    
    Coverity issue: #1061270
    
    https://bugzilla.gnome.org/show_bug.cgi?id=730376

 camel/providers/local/camel-mbox-summary.c |    9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)
---
diff --git a/camel/providers/local/camel-mbox-summary.c b/camel/providers/local/camel-mbox-summary.c
index 413fd08..9d390e0 100644
--- a/camel/providers/local/camel-mbox-summary.c
+++ b/camel/providers/local/camel-mbox-summary.c
@@ -518,9 +518,14 @@ summary_update (CamelLocalSummary *cls,
        while (camel_mime_parser_step (mp, NULL, NULL) == CAMEL_MIME_PARSER_STATE_FROM) {
                CamelMessageInfo *info;
                goffset pc = camel_mime_parser_tell_start_from (mp) + 1;
+               gint progress;
 
-               camel_operation_progress (
-                       cancellable, (gint) (((gfloat) pc / size) * 100));
+               /* To avoid a division by zero if the fstat()
+                * call above failed. */
+               size = MAX (size, pc);
+               progress = (size > 0) ? (gint) (((gfloat) pc / size) * 100) : 0;
+
+               camel_operation_progress (cancellable, progress);
 
                info = camel_folder_summary_info_new_from_parser (s, mp);
                camel_folder_summary_add (s, info);