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Subject: [Bug gdb/27847] A possible divide by zero bug in
 amd64_has_unaligned_fields (amd64-tdep.c)
Date: Mon, 07 Jun 2021 15:56:50 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D27847

--- Comment #6 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gn=
u.org> ---
The master branch has been updated by Andrew Burgess <aburgess@sourceware.o=
rg>:

https://sourceware.org/git/gitweb.cgi?p=3Dbinutils-gdb.git;h=3Da12a15e7c5ff=
9f3549dd185fa1acd5a9dddd001b

commit a12a15e7c5ff9f3549dd185fa1acd5a9dddd001b
Author: Andrew Burgess <andrew.burgess@embecosm.com>
Date:   Wed May 12 13:44:06 2021 +0100

    gdb: handle case where type alignment is unknown

    It was spotted that if type_align returned 0 then it was possible to
    trigger a divide by zero exception within GDB.  It turns out this will
    only happen in an edge case where GDB is unable to figure out the
    alignment of a field within a structure.

    The attached test generates some non-standard, probably broken, DWARF,
    that triggers this condition, and then fixes this issue by throwing an
    exception when this case occurs.

    gdb/ChangeLog:

            PR gdb/27847
            * amd64-tdep.c (amd64_has_unaligned_fields): Move call to
            type_align, and spot case where the alignment is unknown.

    gdb/testsuite/ChangeLog:

            PR gdb/27847
            * gdb.dwarf2/dw2-weird-type-len.c: New file.
            * gdb.dwarf2/dw2-weird-type-len.exp: New file.

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