[jira] Created: (STDCXX-891) [HP aCC 6.16] warning 4232: potential misaligned access in iso2022.cpp

[HP aCC 6.16] warning 4232: potential misaligned access in iso2022.cpp
----------------------------------------------------------------------

                 Key: STDCXX-891
                 URL: https://issues.apache.org/jira/browse/STDCXX-891
             Project: C++ Standard Library
          Issue Type: Bug
          Components: 22. Localization
    Affects Versions: 4.2.0, 4.1.4, 4.1.3, 4.1.2
         Environment: aCC: HP C/aC++ B3910B A.06.16 [Nov 26 2007]
            Reporter: Martin Sebor
             Fix For: 4.2.2


The cast from {{mbstate_t*}} to {{unsigned short*}} in [{{iso2022.cpp}}|http://svn.apache.org/viewvc/stdcxx/trunk/src/iso2022.cpp] and subsequently dereferencing the pointer is unsafe because we don't know the alignment requirement of {{mbstate_t}} and because the type itself might be smaller that {{unsigned short}}, including as small as plain {{char}} as happens to be the case on IRIX.

{noformat}
aCC -c    -mt -I$(TOPDIR)/include -I$(BUILDDIR)/include  -AA  +O2  +DD64 +w \
    +W392 +W655 +W684 +W818 +W819 +W849 +W2193 +W2236 +W2261 \
    +W2340 +W2401 +W2487 +W4227 +W4229 +W4231 +W4235 +W4237 \
    +W4249 +W4255 +W4272 +W4284 +W4285 +W4286  +Z  $(TOPDIR)/src/iso2022.cpp
"$(TOPDIR)/src/iso2022.cpp", line 472: warning #4232-D: conversion from "mbstate_t *" to a more strictly aligned type "unsigned short *" may cause misaligned access
          _RWSTD_REINTERPRET_CAST (ISO_2022_STATE_INDEX_T*, &state);
          ^

"$(TOPDIR)/src/iso2022.cpp", line 766, procedure __rw::__rw_iso2022jp_designate: warning #20200-D: Potential null pointer dereference through esc is detected (null definition:$(TOPDIR)/src/iso2022.cpp, line 679)

"$(TOPDIR)/src/iso2022.cpp", line 1543, procedure __rw::__rw_ucs4_to_interm: warning #20206-D: Out of bound access (buffer "db_array" byte range is [0 - 11], access range at [0 - 23])

"$(TOPDIR)/src/iso2022.cpp", line 1588, procedure __rw::__rw_ucs4_to_interm: warning #20206-D: Out of bound access (buffer "db_array" byte range is [0 - 11], access range at [0 - 23])
{noformat}

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     [ https://issues.apache.org/jira/browse/STDCXX-891?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Martin Sebor updated STDCXX-891:
--------------------------------

    Priority: Minor  (was: Major)

Lowered Priority as there is no test case showing a runtime error.

> [HP aCC 6.16] warning 4232: potential misaligned access in iso2022.cpp
> ----------------------------------------------------------------------
>
>                 Key: STDCXX-891
>                 URL: https://issues.apache.org/jira/browse/STDCXX-891
>             Project: C++ Standard Library
>          Issue Type: Bug
>          Components: 22. Localization
>    Affects Versions: 4.1.2, 4.1.3, 4.1.4, 4.2.0
>         Environment: aCC: HP C/aC++ B3910B A.06.16 [Nov 26 2007]
>            Reporter: Martin Sebor
>            Priority: Minor
>             Fix For: 4.2.2
>
>   Original Estimate: 2h
>  Remaining Estimate: 2h
>
> The cast from {{mbstate_t*}} to {{unsigned short*}} in [{{iso2022.cpp}}|http://svn.apache.org/viewvc/stdcxx/trunk/src/iso2022.cpp] and subsequently dereferencing the pointer is unsafe because we don't know the alignment requirement of {{mbstate_t}} and because the type itself might be smaller that {{unsigned short}}, including as small as plain {{char}} as happens to be the case on IRIX.
> {noformat}
> aCC -c    -mt -I$(TOPDIR)/include -I$(BUILDDIR)/include  -AA  +O2  +DD64 +w \
>     +W392 +W655 +W684 +W818 +W819 +W849 +W2193 +W2236 +W2261 \
>     +W2340 +W2401 +W2487 +W4227 +W4229 +W4231 +W4235 +W4237 \
>     +W4249 +W4255 +W4272 +W4284 +W4285 +W4286  +Z  $(TOPDIR)/src/iso2022.cpp
> "$(TOPDIR)/src/iso2022.cpp", line 472: warning #4232-D: conversion from "mbstate_t *" to a more strictly aligned type "unsigned short *" may cause misaligned access
>           _RWSTD_REINTERPRET_CAST (ISO_2022_STATE_INDEX_T*, &state);
>           ^
> "$(TOPDIR)/src/iso2022.cpp", line 766, procedure __rw::__rw_iso2022jp_designate: warning #20200-D: Potential null pointer dereference through esc is detected (null definition:$(TOPDIR)/src/iso2022.cpp, line 679)
> "$(TOPDIR)/src/iso2022.cpp", line 1543, procedure __rw::__rw_ucs4_to_interm: warning #20206-D: Out of bound access (buffer "db_array" byte range is [0 - 11], access range at [0 - 23])
> "$(TOPDIR)/src/iso2022.cpp", line 1588, procedure __rw::__rw_ucs4_to_interm: warning #20206-D: Out of bound access (buffer "db_array" byte range is [0 - 11], access range at [0 - 23])
> {noformat}

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