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

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

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=a3b473373ee43a292f5ec68a7fda6b9cfb26a9b0

commit a3b473373ee43a292f5ec68a7fda6b9cfb26a9b0
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.

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

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