CVE-2024-40951

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> ocfs2: fix NULL pointer dereference in ocfs2_abort_trigger()<br /> <br /> bdev-&gt;bd_super has been removed and commit 8887b94d9322 change the usage<br /> from bdev-&gt;bd_super to b_assoc_map-&gt;host-&gt;i_sb. Since ocfs2 hasn&amp;#39;t set<br /> bh-&gt;b_assoc_map, it will trigger NULL pointer dereference when calling<br /> into ocfs2_abort_trigger().<br /> <br /> Actually this was pointed out in history, see commit 74e364ad1b13. But<br /> I&amp;#39;ve made a mistake when reviewing commit 8887b94d9322 and then<br /> re-introduce this regression.<br /> <br /> Since we cannot revive bdev in buffer head, so fix this issue by<br /> initializing all types of ocfs2 triggers when fill super, and then get the<br /> specific ocfs2 trigger from ocfs2_caching_info when access journal.<br /> <br /> [joseph.qi@linux.alibaba.com: v2]