CVE-2024-48881

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> bcache: revert replacing IS_ERR_OR_NULL with IS_ERR again<br /> <br /> Commit 028ddcac477b ("bcache: Remove unnecessary NULL point check in<br /> node allocations") leads a NULL pointer deference in cache_set_flush().<br /> <br /> 1721 if (!IS_ERR_OR_NULL(c-&gt;root))<br /> 1722 list_add(&amp;c-&gt;root-&gt;list, &amp;c-&gt;btree_cache);<br /> <br /> &gt;From the above code in cache_set_flush(), if previous registration code<br /> fails before allocating c-&gt;root, it is possible c-&gt;root is NULL as what<br /> it is initialized. __bch_btree_node_alloc() never returns NULL but<br /> c-&gt;root is possible to be NULL at above line 1721.<br /> <br /> This patch replaces IS_ERR() by IS_ERR_OR_NULL() to fix this.