CVE-2024-43890

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> tracing: Fix overflow in get_free_elt()<br /> <br /> "tracing_map-&gt;next_elt" in get_free_elt() is at risk of overflowing.<br /> <br /> Once it overflows, new elements can still be inserted into the tracing_map<br /> even though the maximum number of elements (`max_elts`) has been reached.<br /> Continuing to insert elements after the overflow could result in the<br /> tracing_map containing "tracing_map-&gt;max_size" elements, leaving no empty<br /> entries.<br /> If any attempt is made to insert an element into a full tracing_map using<br /> `__tracing_map_insert()`, it will cause an infinite loop with preemption<br /> disabled, leading to a CPU hang problem.<br /> <br /> Fix this by preventing any further increments to "tracing_map-&gt;next_elt"<br /> once it reaches "tracing_map-&gt;max_elt".