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[Bug malloc/20284] malloc: Corrupt arena avoidance causes unnecessary mmap fallbacks


https://sourceware.org/bugzilla/show_bug.cgi?id=20284

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The branch, gentoo/2.23 has been updated
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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=3f97c0cafa1d661fe2ffa946c215f613beb32cd6

commit 3f97c0cafa1d661fe2ffa946c215f613beb32cd6
Author: Florian Weimer <fweimer@redhat.com>
Date:   Tue Jun 21 21:29:21 2016 +0200

    malloc: Avoid premature fallback to mmap [BZ #20284]

    Before this change, the while loop in reused_arena which avoids
    returning a corrupt arena would never execute its body if the selected
    arena were not corrupt.  As a result, result == begin after the loop,
    and the function returns NULL, triggering fallback to mmap.

    (cherry picked from commit a3b473373ee43a292f5ec68a7fda6b9cfb26a9b0)
    (cherry picked from commit a69d26143b80cb1927481509279577c57bc22ba4)

-----------------------------------------------------------------------

Summary of changes:
 malloc/arena.c |   10 ++++------
 1 files changed, 4 insertions(+), 6 deletions(-)

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