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maple_tree: add smp_rmb() to dead node detection
authorLiam R. Howlett <Liam.Howlett@Oracle.com>
Mon, 27 Feb 2023 17:36:05 +0000 (09:36 -0800)
committerLiam R. Howlett <Liam.Howlett@oracle.com>
Fri, 24 Mar 2023 15:18:37 +0000 (11:18 -0400)
commit0e3242d07a7bbf3a9a495e118aac10f12e53438f
tree0ce46c45bba0c6d0fd798bc86d372ab05fca26c0tree
parent3e2f95fcb190a6f0103258db09c7584d0fe6f31bcommit | diff
maple_tree: add smp_rmb() to dead node detection

Add an smp_rmb() before reading the parent pointer to ensure that anything
read from the node prior to the parent pointer hasn't been reordered ahead
of this check.

The is necessary for RCU mode.

Link: https://lkml.kernel.org/r/20230227173632.3292573-7-surenb@google.com
Fixes: 54a611b60590 ("Maple Tree: add new data structure")
Cc: stable@vger.kernel.org
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
lib/maple_tree.c diff | blob | history
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