• Tejun Heo's avatar
    fs/aio: Use RCU accessors for kioctx_table->table[] · d0264c01
    Tejun Heo authored
    While converting ioctx index from a list to a table, db446a08
    ("aio: convert the ioctx list to table lookup v3") missed tagging
    kioctx_table->table[] as an array of RCU pointers and using the
    appropriate RCU accessors.  This introduces a small window in the
    lookup path where init and access may race.
    
    Mark kioctx_table->table[] with __rcu and use the approriate RCU
    accessors when using the field.
    Signed-off-by: default avatarTejun Heo <tj@kernel.org>
    Reported-by: default avatarJann Horn <jannh@google.com>
    Fixes: db446a08 ("aio: convert the ioctx list to table lookup v3")
    Cc: Benjamin LaHaise <bcrl@kvack.org>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: stable@vger.kernel.org # v3.12+
    d0264c01
aio.c 47.2 KB