md: avoid invalid memory access for array sb->dev_roles
commit 228fc7d7 upstream. we need to gurantee 'desc_nr' valid before access array of sb->dev_roles. In addition, we should avoid .load_super always return '0' when level is LEVEL_MULTIPATH, which is not expected. Reported-by: coverity-bot <keescook+coverity-bot@chromium.org> Addresses-Coverity-ID: 1487373 ("Memory - illegal accesses") Fixes: 6a5cb53a ("md: no longer compare spare disk superblock events in super_load") Signed-off-by: Yufen Yu <yuyufen@huawei.com> Signed-off-by: Song Liu <songliubraving@fb.com> Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
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