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From bugzi...@apache.org
Subject [Bug 53663] New: Use of uninitialized memory in mod_rewrite, when RewriteMap is dbd or fastdbd
Date Mon, 06 Aug 2012 19:31:10 GMT
https://issues.apache.org/bugzilla/show_bug.cgi?id=53663

          Priority: P2
            Bug ID: 53663
          Assignee: bugs@httpd.apache.org
           Summary: Use of uninitialized memory in mod_rewrite, when
                    RewriteMap is dbd or fastdbd
          Severity: major
    Classification: Unclassified
                OS: All
          Reporter: mi+apache@aldan.algebra.com
          Hardware: All
            Status: NEW
           Version: 2.4.2
         Component: mod_rewrite
           Product: Apache httpd-2

Created attachment 29173
  --> https://issues.apache.org/bugzilla/attachment.cgi?id=29173&action=edit
Fix for mod_rewrite's dbd/fastdbd initialization

Without the attached patch, httpd randomly crashes at startup, when one
attempts to use the new dbd-style RewriteMap.

valgrind points at the use of uninitialized memory in mod_rewrite.c:3068 --
indeed, when the map is of type dbd (or fastdbd), the newmap->checkfile remains
uninitialized. The proposed patch fixes the problem by explicitly setting the
field to NULL (there are no files to check in this case).

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