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    md/raid1: fix bio handling problems in process_checks() · 30bc9b53
    NeilBrown 提交于
    Recent change to use bio_copy_data() in raid1 when repairing
    an array is faulty.
    
    The underlying may have changed the bio in various ways using
    bio_advance and these need to be undone not just for the 'sbio' which
    is being copied to, but also the 'pbio' (primary) which is being
    copied from.
    
    So perform the reset on all bios that were read from and do it early.
    
    This also ensure that the sbio->bi_io_vec[j].bv_len passed to
    memcmp is correct.
    
    This fixes a crash during a 'check' of a RAID1 array.  The crash was
    introduced in 3.10 so this is suitable for 3.10-stable.
    
    Cc: stable@vger.kernel.org (3.10)
    Reported-by: NJoe Lawrence <joe.lawrence@stratus.com>
    Signed-off-by: NNeilBrown <neilb@suse.de>
    30bc9b53
raid1.c 83.0 KB