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resolv: Avoid GCC 12 false positive warning [BZ #28439]. 

Replace a call to sprintf with an equivalent pair of stpcpy/strcpy calls
to avoid a GCC 12 -Wformat-overflow false positive due to recent optimizer
improvements.

(cherry picked from commit eb73b87897)
This commit is contained in:
Martin Sebor 2021-10-11 09:36:57 -06:00 committed by Florian Weimer
parent d36f457870
commit 92d5c52aaa
1 changed files with 3 additions and 1 deletions
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resolv/res_query.c
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@ -610,7 +610,9 @@ __res_context_querydomain (struct resolv_context *ctx,
RES_SET_H_ERRNO(statp, NO_RECOVERY); RES_SET_H_ERRNO(statp, NO_RECOVERY);
return (-1); return (-1);
} }
sprintf(nbuf, "%s.%s", name, domain); char *p = __stpcpy (nbuf, name);
*p++ = '.';
strcpy (p, domain);
} }
return __res_context_query (ctx, longname, class, type, answer, return __res_context_query (ctx, longname, class, type, answer,
anslen, answerp, answerp2, nanswerp2, anslen, answerp, answerp2, nanswerp2,