diff options
| author | Matthew Wilcox <willy@linux.intel.com> | 2016-02-02 16:57:55 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-02-25 12:01:23 -0800 |
| commit | 077b6173a8c89d666a06203f42267ff8b6d02d73 (patch) | |
| tree | 436055b69d5506cfc4990a94d4251f4bd517dd90 /lib/dump_stack.c | |
| parent | f4595e0081495b677a98c780e9ec1ab68ce89488 (diff) | |
drivers/hwspinlock: fix race between radix tree insertion and lookup
commit c6400ba7e13a41539342f1b6e1f9e78419cb0148 upstream.
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>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'lib/dump_stack.c')
0 files changed, 0 insertions, 0 deletions