linux-kernel - [PATCH Fix 0/2] Fix out-of-bounds maple tree isue

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Message-ID: <20220722160546.1478722-1-Liam.Howlett@oracle.com>
Date:   Fri, 22 Jul 2022 16:06:02 +0000
From:   Liam Howlett <liam.howlett@...cle.com>
To:     "maple-tree@...ts.infradead.org" <maple-tree@...ts.infradead.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Yu Zhao <yuzhao@...gle.com>
CC:     Hugh Dickins <hughd@...gle.com>
Subject: [PATCH Fix 0/2] Fix out-of-bounds maple tree isue

The out of bounds maple tree issue was actually a maple tree error being
treated as a node.  This was caused by the requested allocation of more
nodes than was available while forking, but there was no memory
available.  This series adds one node to the calculated
mas_expected_entries() to ensure there is enough nodes, adds a flag to
WARN_ON() if a request for nodes is hit with zero nodes available during
a preallocated operation, and also adds the necessary check in the fork
operation to fail.

Liam R. Howlett (2):
  maple_tree: Fix mas_expected_entries() off by one
  kernel/fork: Detect mas_store() failure in dup_mmap()

 include/linux/maple_tree.h |  1 +
 kernel/fork.c              |  5 +++++
 lib/maple_tree.c           | 26 +++++++++++++++++++++-----
 3 files changed, 27 insertions(+), 5 deletions(-)

-- 
2.35.1