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Brian Atkinson
c8184d714b
dmu_buf_will_clone() calls arc_buf_destroy() if there is an associated ARC buffer with the dbuf. However, this can only be done conditionally. If the previous dirty record's dr_data is pointed at db_dbf then destroying it can lead to NULL pointer deference when syncing out the previous dirty record. This updates dmu_buf_fill_clone() to only call arc_buf_destroy() if the previous dirty records dr_data is not pointing to db_buf. The block clone wil still set the dbuf's db_buf and db_data to NULL, but this will not cause any issues as any previous dirty record dr_data will still be pointing at the ARC buffer. Reviewed-by: Allan Jude <allan@klarasystems.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Alexander Motin <mav@FreeBSD.org> Signed-off-by: Brian Atkinson <batkinson@lanl.gov> Closes #16337