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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug middle-end/104069] -Werror=use-after-free false positive on elfutils-0.186 Date: Tue, 18 Jan 2022 22:06:54 +0000 [thread overview] Message-ID: <bug-104069-4-mW8PqIy7rZ@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-104069-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104069 Martin Sebor <msebor at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Component|tree-optimization |middle-end --- Comment #7 from Martin Sebor <msebor at gcc dot gnu.org> --- The debug_ranger() output is below for reference: =========== BB 2 ============ Imports: ret_13 Exports: ret_13 size_9(D) int VARYING <bb 2> : _1 = (long unsigned int) size_9(D); ret_13 = __builtin_realloc (ptr_11(D), _1); if (ret_13 == 0B) goto <bb 3>; [INV] else goto <bb 5>; [INV] _1 : long unsigned int [0, 2147483647][18446744071562067968, +INF] 2->3 (T) ret_13 : void * [0B, 0B] 2->5 (F) ret_13 : void * [1B, +INF] =========== BB 3 ============ Imports: size_9(D) Exports: size_9(D) size_9(D) int VARYING ret_13 void * [0B, 0B] <bb 3> : if (size_9(D) == 0) goto <bb 4>; [INV] else goto <bb 5>; [INV] 3->4 (T) size_9(D) : int [0, 0] 3->5 (F) size_9(D) : int [-INF, -1][1, +INF] =========== BB 4 ============ <bb 4> : ret_15 = __builtin_realloc (ptr_11(D), 1); =========== BB 5 ============ Imports: ret_3 Exports: ret_3 <bb 5> : # ret_3 = PHI <ret_13(2), ret_13(3), ret_15(4)> if (ret_3 == 0B) goto <bb 6>; [INV] else goto <bb 11>; [INV] 5->6 (T) ret_3 : void * [0B, 0B] 5->11 (F) ret_3 : void * [1B, +INF] =========== BB 6 ============ Imports: ret_17 Exports: ret_17 size_9(D) int VARYING <bb 6> : _2 = (long unsigned int) size_9(D); ret_17 = __builtin_realloc (ptr_11(D), _2); if (ret_17 == 0B) goto <bb 7>; [INV] else goto <bb 9>; [INV] _2 : long unsigned int [0, 2147483647][18446744071562067968, +INF] 6->7 (T) ret_17 : void * [0B, 0B] 6->9 (F) ret_17 : void * [1B, +INF] =========== BB 7 ============ Imports: size_9(D) Exports: size_9(D) size_9(D) int VARYING ret_17 void * [0B, 0B] <bb 7> : if (size_9(D) == 0) goto <bb 8>; [INV] else goto <bb 9>; [INV] 7->8 (T) size_9(D) : int [0, 0] 7->9 (F) size_9(D) : int [-INF, -1][1, +INF] =========== BB 8 ============ <bb 8> : ret_19 = __builtin_realloc (ptr_11(D), 1); =========== BB 9 ============ Imports: ret_4 Exports: ret_4 <bb 9> : # ret_4 = PHI <ret_17(6), ret_17(7), ret_19(8)> if (ret_4 == 0B) goto <bb 10>; [INV] else goto <bb 11>; [INV] 9->10 (T) ret_4 : void * [0B, 0B] 9->11 (F) ret_4 : void * [1B, +INF] =========== BB 10 ============ <bb 10> : __builtin_abort (); =========== BB 11 ============ Equivalence set : [] Equivalence set : [ret_5, _21] <bb 11> : # ret_5 = PHI <ret_3(5), ret_4(9)> _21 = ret_5; ret_5 : void * [1B, +INF] _21 : void * [1B, +INF] =========== BB 12 ============ <bb 12> : <L15>: return _21; Non-varying global ranges: =========================: _1 : long unsigned int [0, 2147483647][18446744071562067968, +INF] _2 : long unsigned int [0, 2147483647][18446744071562067968, +INF] ret_5 : void * [1B, +INF] _21 : void * [1B, +INF]
next prev parent reply other threads:[~2022-01-18 22:06 UTC|newest] Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-01-17 17:18 [Bug c/104069] New: " slyfox at gcc dot gnu.org 2022-01-17 17:27 ` [Bug tree-optimization/104069] " pinskia at gcc dot gnu.org 2022-01-17 17:29 ` slyfox at gcc dot gnu.org 2022-01-17 19:10 ` msebor at gcc dot gnu.org 2022-01-17 21:52 ` msebor at gcc dot gnu.org 2022-01-18 9:37 ` slyfox at gcc dot gnu.org 2022-01-18 22:03 ` msebor at gcc dot gnu.org 2022-01-18 22:06 ` msebor at gcc dot gnu.org [this message] 2022-01-18 22:17 ` [Bug middle-end/104069] " jakub at gcc dot gnu.org 2022-01-18 22:47 ` msebor at gcc dot gnu.org 2022-01-18 22:56 ` jakub at gcc dot gnu.org 2022-01-19 0:51 ` amacleod at redhat dot com 2022-01-19 1:04 ` cvs-commit at gcc dot gnu.org 2022-01-19 20:22 ` msebor at gcc dot gnu.org 2022-01-19 20:24 ` msebor at gcc dot gnu.org 2022-01-19 20:30 ` pinskia at gcc dot gnu.org 2022-01-19 20:31 ` pinskia at gcc dot gnu.org 2022-01-19 20:32 ` msebor at gcc dot gnu.org 2022-01-19 20:34 ` jakub at gcc dot gnu.org 2022-01-19 20:42 ` jakub at gcc dot gnu.org 2022-01-19 20:54 ` msebor at gcc dot gnu.org 2022-01-31 11:18 ` jakub at gcc dot gnu.org 2022-03-17 19:32 ` msebor at gcc dot gnu.org 2022-05-16 14:14 ` eike@sf-mail.de 2022-08-24 8:51 ` vincent at systemli dot org 2022-10-27 16:57 ` mark at gcc dot gnu.org 2022-10-28 7:36 ` slyfox at gcc dot gnu.org 2023-05-10 3:35 ` [Bug middle-end/104069] Wuse-after-free=2 -O0 false positive "may be used" mkaracsony81 at gmail dot com 2023-05-12 7:00 ` slyfox at gcc dot gnu.org 2023-05-12 8:30 ` mkaracsony81 at gmail dot com 2023-05-12 9:08 ` slyfox at gcc dot gnu.org 2023-05-12 13:20 ` mkaracsony81 at gmail dot com 2023-05-12 20:36 ` slyfox at gcc dot gnu.org 2023-05-13 5:07 ` mkaracsony81 at gmail dot com 2023-05-13 5:07 ` mkaracsony81 at gmail dot com 2023-12-17 4:40 ` lavr at ncbi dot nlm.nih.gov
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