4399b0303a
The variable-sized encoding-specific storage of a struct contenc_writer
currently relies on void * alignment that may be insufficient with
regards to the specific storage fields, although having not caused any
problems yet.
In addition, gcc 11.3 issues a warning on access to fields of partially
allocated structures that can occur when the specific storage size is 0:
content_encoding.c: In function ‘Curl_build_unencoding_stack’:
content_encoding.c:980:21: warning: array subscript ‘struct contenc_writer[0]’ is partly outside array bounds of ‘unsigned char[16]’ [-Warray-bounds]
980 | writer->handler = handler;
| ~~~~~~~~~~~~~~~~^~~~~~~~~
In file included from content_encoding.c:49:
memdebug.h:115:29: note: referencing an object of size 16 allocated by ‘curl_dbg_calloc’
115 | #define calloc(nbelem,size) curl_dbg_calloc(nbelem, size, __LINE__, __FILE__)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
content_encoding.c:977:60: note: in expansion of macro ‘calloc’
977 | struct contenc_writer *writer = (struct contenc_writer *)calloc(1, sz);
To solve both these problems, the current commit replaces the
contenc_writer/params structure pairs by "subclasses" of struct
contenc_writer. These are structures that contain a contenc_writer at
offset 0. Proper field alignment is therefore handled by the compiler and
full structure allocation is performed, silencing the warnings.
Closes #9455
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| .circleci | ||
| .github | ||
| .lift | ||
| .reuse | ||
| CMake | ||
| docs | ||
| include | ||
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| LICENSES | ||
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| .mailmap | ||
| acinclude.m4 | ||
| appveyor.yml | ||
| buildconf | ||
| buildconf.bat | ||
| CHANGES | ||
| CMakeLists.txt | ||
| configure.ac | ||
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| curl-config.in | ||
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| README | ||
| README.md | ||
| RELEASE-NOTES | ||
| SECURITY.md | ||
Curl is a command-line tool for transferring data specified with URL syntax. Find out how to use curl by reading the curl.1 man page or the MANUAL document. Find out how to install Curl by reading the INSTALL document.
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