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Date:      Tue, 25 Jan 2022 07:11:23 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 261457] Fix a possible Null pointer dereference in mld_is_addr_reported()
Message-ID:  <bug-261457-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D261457

            Bug ID: 261457
           Summary: Fix a possible Null pointer dereference in
                    mld_is_addr_reported()
           Product: Base System
           Version: Unspecified
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: zhou1615@umn.edu

Created attachment 231297
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D231297&action=
=3Dedit
A simple fix for this bug

In mld_is_addr_reported(), the return value of mli_alloc_locked() is assign=
ed
to mli and there is a dereference of it after that, which could lead to NULL
pointer dereference on failure of allocation.

Fix this bug by adding a NULL check of mli.

This bug is found by a static analyzer, please advise.

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