[Bug target/84272] [7 Regression] AddressSanitizer: heap-use-after-free ../../gcc/config/aarch64/cortex-a57-fma-steering.c:519 in fma_node::get_parity()

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84272

--- Comment #16 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Thu Mar 14 09:18:07 2019
New Revision: 269676

URL: https://gcc.gnu.org/viewcvs?rev=269676&root=gcc&view=rev
Log:
2019-03-14  Richard Biener  <rguent...@suse.de>

        Backport from mainline
        2018-02-16  Jakub Jelinek  <ja...@redhat.com>

        PR target/84272
        * config/aarch64/cortex-a57-fma-steering.c (fma_forest::merge_forest):
        Use ++iter rather than iter++ for std::list iterators.
        (func_fma_steering::dfs): Likewise.  Don't delete nodes right away,
        defer deleting them until all nodes in the forest are processed.  Do
        free even leaf nodes.  Change to_process into auto_vec.

        * g++.dg/opt/pr84272.C: New test.

Added:
    branches/gcc-7-branch/gcc/testsuite/g++.dg/opt/pr84272.C
Modified:
    branches/gcc-7-branch/gcc/ChangeLog
    branches/gcc-7-branch/gcc/config/aarch64/cortex-a57-fma-steering.c
    branches/gcc-7-branch/gcc/testsuite/ChangeLog