maple_tree: add smp_rmb() to dead node detection

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commit 0a2b18d948 upstream.

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: 54a611b605 ("Maple Tree: add new data structure")
Cc: stable@vger.kernel.org
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Liam R. Howlett 2023-04-11 11:10:53 -04:00 • committed by Greg Kroah-Hartman

parent d3af5f8a50

commit a29025a1b6

1 changed files with 6 additions and 2 deletions

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lib/maple_tree.c

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