CVE-2024-43889

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> padata: Fix possible divide-by-0 panic in padata_mt_helper()<br /> <br /> We are hit with a not easily reproducible divide-by-0 panic in padata.c at<br /> bootup time.<br /> <br /> [ 10.017908] Oops: divide error: 0000 1 PREEMPT SMP NOPTI<br /> [ 10.017908] CPU: 26 PID: 2627 Comm: kworker/u1666:1 Not tainted 6.10.0-15.el10.x86_64 #1<br /> [ 10.017908] Hardware name: Lenovo ThinkSystem SR950 [7X12CTO1WW]/[7X12CTO1WW], BIOS [PSE140J-2.30] 07/20/2021<br /> [ 10.017908] Workqueue: events_unbound padata_mt_helper<br /> [ 10.017908] RIP: 0010:padata_mt_helper+0x39/0xb0<br /> :<br /> [ 10.017963] Call Trace:<br /> [ 10.017968] <br /> [ 10.018004] ? padata_mt_helper+0x39/0xb0<br /> [ 10.018084] process_one_work+0x174/0x330<br /> [ 10.018093] worker_thread+0x266/0x3a0<br /> [ 10.018111] kthread+0xcf/0x100<br /> [ 10.018124] ret_from_fork+0x31/0x50<br /> [ 10.018138] ret_from_fork_asm+0x1a/0x30<br /> [ 10.018147] <br /> <br /> Looking at the padata_mt_helper() function, the only way a divide-by-0<br /> panic can happen is when ps-&gt;chunk_size is 0. The way that chunk_size is<br /> initialized in padata_do_multithreaded(), chunk_size can be 0 when the<br /> min_chunk in the passed-in padata_mt_job structure is 0.<br /> <br /> Fix this divide-by-0 panic by making sure that chunk_size will be at least<br /> 1 no matter what the input parameters are.