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From: "hjl.tools at gmail dot com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/113752] [14 Regression] warning: ‘%s’ directive writing up to 10218 bytes into a region of size between 0 and 10240 [-Wformat-overflow=] Date: Sun, 04 Feb 2024 06:15:35 +0000 [thread overview] Message-ID: <bug-113752-4-sYYuMJWJcB@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-113752-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113752 --- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> --- [hjl@gnu-skx-1 gcc]$ cat /tmp/foo.i char a[10256]; char b; char *c, *g; int d, e, f; int sprintf(char *, char *, ...); unsigned long strlen(char *); int h(char *j) { if (strlen(j) + strlen(c) + strlen(g) + 32 > 10256) return 0; sprintf(a, "%s:%s:%d:%d:%d:%c:%s\n", j, c, d, e, f, b, g); return 1; } void i() { h("wctype"); } [hjl@gnu-skx-1 gcc]$ ./xgcc -B./ -O3 -Wall -S /tmp/foo.i /tmp/foo.i: In function ?i?: /tmp/foo.i:10:33: warning: ?%s? directive writing up to 10218 bytes into a region of size between 0 and 10240 [-Wformat-overflow=] 10 | sprintf(a, "%s:%s:%d:%d:%d:%c:%s\n", j, c, d, e, f, b, g); | ^~ In function ?h?, inlined from ?i? at /tmp/foo.i:13:12: /tmp/foo.i:10:3: note: ?sprintf? output between 18 and 20484 bytes into a destination of size 10256 10 | sprintf(a, "%s:%s:%d:%d:%d:%c:%s\n", j, c, d, e, f, b, g); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ [hjl@gnu-skx-1 gcc]$
next prev parent reply other threads:[~2024-02-04 6:15 UTC|newest] Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top 2024-02-04 4:34 [Bug c/113752] New: " hjl.tools at gmail dot com 2024-02-04 4:47 ` [Bug tree-optimization/113752] " pinskia at gcc dot gnu.org 2024-02-04 5:58 ` hjl.tools at gmail dot com 2024-02-04 6:15 ` hjl.tools at gmail dot com [this message] 2024-02-12 9:46 ` [Bug tree-optimization/113752] [14 Regression] warning: ‘%s’ directive writing up to 10218 bytes into a region of size between 0 and 10240 [-Wformat-overflow=] since r14-261-g0ef3756adf078c aldyh at gcc dot gnu.org 2024-02-12 10:09 ` jakub at gcc dot gnu.org 2024-02-12 10:23 ` jakub at gcc dot gnu.org 2024-02-12 13:52 ` hjl.tools at gmail dot com 2024-02-13 11:36 ` jakub at gcc dot gnu.org 2024-03-07 20:41 ` law at gcc dot gnu.org 2024-05-07 7:44 ` [Bug tree-optimization/113752] [14/15 " rguenth at gcc dot gnu.org
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