[Bug libc/22375] malloc returns pointer from tcache_get when should return NULL (CVE-2017-17426)

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https://sourceware.org/bugzilla/show_bug.cgi?id=22375

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=df8c219cb987cfe85c550efa693a1383a11e38aa

commit df8c219cb987cfe85c550efa693a1383a11e38aa
Author: Arjun Shankar <arjun@redhat.com>
Date:   Thu Nov 30 13:31:45 2017 +0100

    Fix integer overflow in malloc when tcache is enabled [BZ #22375]

    When the per-thread cache is enabled, __libc_malloc uses request2size
(which
    does not perform an overflow check) to calculate the chunk size from the
    requested allocation size. This leads to an integer overflow causing malloc
    to incorrectly return the last successfully allocated block when called
with
    a very large size argument (close to SIZE_MAX).

    This commit uses checked_request2size instead, removing the overflow.

    (cherry picked from commit 34697694e8a93b325b18f25f7dcded55d6baeaf6)

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

Summary of changes:
 ChangeLog       |    7 +++++++
 NEWS            |    6 ++++++
 malloc/malloc.c |    3 ++-
 3 files changed, 15 insertions(+), 1 deletions(-)

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