https://github.com/torvalds/linux
Revision 159f5bdadcdda638aad5a234b58d6031aa4ef8aa authored by Johannes Berg on 21 December 2023, 14:04:45 UTC, committed by Greg Kroah-Hartman on 22 December 2023, 06:33:02 UTC
Tetsuo Handa pointed out that in the (now reverted)
lockdep commit I initialized the data too late. The
same is true for the cancellation data, it must be
initialized before the cmpxchg(), otherwise it may
be done twice and possibly even overwriting data in
there already when there's a race. Fix that, which
also requires destroying the mutex in case we lost
the race.

Fixes: 8c88a474357e ("debugfs: add API to allow debugfs operations cancellation")
Reported-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Link: https://lore.kernel.org/r/20231221150444.1e47a0377f80.If7e8ba721ba2956f12c6e8405e7d61e154aa7ae7@changeid
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1 parent d400543
History
Tip revision: 159f5bdadcdda638aad5a234b58d6031aa4ef8aa authored by Johannes Berg on 21 December 2023, 14:04:45 UTC
debugfs: initialize cancellations earlier
Tip revision: 159f5bd
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