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| author | Matthew Wilcox <willy@linux.intel.com> | 2016-02-03 01:57:55 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-02-03 17:28:43 +0100 |
| commit | c6400ba7e13a41539342f1b6e1f9e78419cb0148 (patch) | |
| tree | 4ac7cac19e5d9cfc275a7d99f11ea21026f20275 /mm | |
| parent | radix-tree: fix race in gang lookup (diff) | |
| download | linux-c6400ba7e13a41539342f1b6e1f9e78419cb0148.tar.xz linux-c6400ba7e13a41539342f1b6e1f9e78419cb0148.zip | |
drivers/hwspinlock: fix race between radix tree insertion and lookup
of_hwspin_lock_get_id() is protected by the RCU lock, which means that
insertions can occur simultaneously with the lookup. If the radix tree
transitions from a height of 0, we can see a slot with the indirect_ptr
bit set, which will cause us to at least read random memory, and could
cause other havoc.
Fix this by using the newly introduced radix_tree_iter_retry().
Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Ohad Ben-Cohen <ohad@wizery.com>
Cc: Konstantin Khlebnikov <khlebnikov@openvz.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
0 files changed, 0 insertions, 0 deletions