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On s390x when compiling with GCC 12, I get this warning:
utf8-utf16-z9.c:
../iconv/loop.c: In function ‘__from_utf8_loop_etf3eh_single’:
../iconv/loop.c:445:22: error: writing 1 byte into a region of size 0 [-Werror=stringop-overflow=]
445 | bytebuf[inlen++] = *inptr++;
| ~~~~~~~~~~~~~~~~~^~~~~~~~~~
../iconv/loop.c:381:17: note: at offset 4 into destination object ‘bytebuf’ of size 4
381 | unsigned char bytebuf[MAX_NEEDED_INPUT];
| ^~~~~~~
../iconv/loop.c:445:22: error: writing 1 byte into a region of size 0 [-Werror=stringop-overflow=]
445 | bytebuf[inlen++] = *inptr++;
| ~~~~~~~~~~~~~~~~~^~~~~~~~~~
../iconv/loop.c:381:17: note: at offset 5 into destination object ‘bytebuf’ of size 4
381 | unsigned char bytebuf[MAX_NEEDED_INPUT];
| ^~~~~~~
This patch tells the compiler that inend is always behind inptr which
avoids the warning. Note that the SINGLE function is only used to
implement the mb*towc*() or wc*tomb*() functions. Those functions use
inptr and inend pointing to a variable on stack, compute the inend pointer
or explicitly check the arguments which always leads to inptr < inend.
Special notes for backporters (according to Siddhesh Poyarekar):
If someone wants to backport this patch to release branches, they should
also backport the following wcrtomb change. Otherwise the assumptions
assumed by this patch are not true.
commit
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|---|---|---|
| .. | ||
| dummy-repertoire.c | ||
| gconv_builtin.c | ||
| gconv_builtin.h | ||
| gconv_cache.c | ||
| gconv_charset.c | ||
| gconv_charset.h | ||
| gconv_close.c | ||
| gconv_conf.c | ||
| gconv_db.c | ||
| gconv_dl.c | ||
| gconv_int.h | ||
| gconv_open.c | ||
| gconv_parseconfdir.h | ||
| gconv_simple.c | ||
| gconv_trans.c | ||
| gconv.c | ||
| gconv.h | ||
| iconv_charmap.c | ||
| iconv_close.c | ||
| iconv_open.c | ||
| iconv_prog.c | ||
| iconv_prog.h | ||
| iconv.c | ||
| iconv.h | ||
| iconvconfig.c | ||
| iconvconfig.h | ||
| loop.c | ||
| Makefile | ||
| skeleton.c | ||
| strtab.c | ||
| test-gconv-modules | ||
| tst-gconv-init-failure-mod.c | ||
| tst-gconv-init-failure.c | ||
| tst-iconv1.c | ||
| tst-iconv2.c | ||
| tst-iconv3.c | ||
| tst-iconv4.c | ||
| tst-iconv5.c | ||
| tst-iconv6.c | ||
| tst-iconv7.c | ||
| tst-iconv8.c | ||
| tst-iconv9.c | ||
| tst-iconv_prog.sh | ||
| tst-iconv-mt.c | ||
| tst-iconv-opt.c | ||
| Versions | ||