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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>
Thu, 23 Mar 2023 15:54:00 +0000 (11:54 -0400)
commit27aa8621029ddcd2ccabfd3dc9911c043c8e6ab3
tree5a44f129dbdd40f39f5cef77bd6993992bc6c506tree
parentc5e59797e526a4c1dc9e0266e2194b374afedc93commit | 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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