[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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