• Dan Williams's avatar
    libnvdimm: fix mishandled nvdimm_clear_poison() return value · 868f036f
    Dan Williams authored
    Colin, via static analysis, reports that the length could be negative
    from nvdimm_clear_poison() in the error case. There was a similar
    problem with commit 0a3f27b9 "libnvdimm, namespace: avoid multiple
    sector calculations" that I noticed when merging the for-4.10/libnvdimm
    topic branch into libnvdimm-for-next, but I missed this one. Fix both of
    them to the following procedure:
    
    * if we clear a block's worth of media, clear that many blocks in
      badblocks
    
    * if we clear less than the requested size of the transfer return an
      error
    
    * always invalidate cache after any non-error / non-zero
      nvdimm_clear_poison result
    
    Fixes: 82bf1037 ("libnvdimm: check and clear poison before writing to pmem")
    Fixes: 0a3f27b9 ("libnvdimm, namespace: avoid multiple sector calculations")
    Cc: Fabian Frederick <fabf@skynet.be>
    Cc: Dave Jiang <dave.jiang@intel.com>
    Reported-by: default avatarColin Ian King <colin.king@canonical.com>
    Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
    868f036f
pmem.c 11.5 KB