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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/107754] Confusing -Warray-bounds warning with strcpy with a null pointer Date: Fri, 18 Nov 2022 21:28:07 +0000 [thread overview] Message-ID: <bug-107754-4-mdUjyxwHwA@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-107754-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107754 Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Last reconfirmed| |2022-11-18 Ever confirmed|0 |1 Summary|Confusing -Warray-bounds |Confusing -Warray-bounds |warning with strcpy |warning with strcpy with a | |null pointer Status|UNCONFIRMED |NEW --- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Confirmed. Note the warning message is correct; just confusing and does not mention a null pointer here. Reduced further: struct Foo { unsigned int a; char bar[1024]; }; void setFoo(const char * value) { struct Foo * ptr = 0; __builtin_strcpy(ptr->bar, value); } ---- CUT --- Since the offset for the character array is non-zero, we see a non-zero constant and (based on other settings) assume it is the null pointer page and we get a size of 0 (which is ok) but don't mention a null pointer. There might be other dups of this but I am not going to search for it right now.
next prev parent reply other threads:[~2022-11-18 21:28 UTC|newest] Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-11-18 21:19 [Bug c/107754] New: Confusing -Warray-bounds warning with strcpy nightstrike at gmail dot com 2022-11-18 21:28 ` pinskia at gcc dot gnu.org [this message] 2022-11-18 21:29 ` [Bug tree-optimization/107754] Confusing -Warray-bounds warning with strcpy with a null pointer and non-zero offset for struct array pinskia at gcc dot gnu.org
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