CVE-2025-37859

In the Linux kernel, the following vulnerability has been resolved:

page_pool: avoid infinite loop to schedule delayed worker

We noticed the kworker in page_pool_release_retry() was waken up repeatedly and infinitely in production because of the buggy driver causing the inflight less than 0 and warning us in page_pool_inflight()[1].

Since the inflight value goes negative, it means we should not expect the whole page_pool to get back to work normally.

This patch mitigates the adverse effect by not rescheduling the kworker when detecting the inflight negative in page_pool_release_retry().

[1] [Mon Feb 10 20:36:11 2025] ————[ cut here ]———— [Mon Feb 10 20:36:11 2025] Negative(-51446) inflight packet-pages … [Mon Feb 10 20:36:11 2025] Call Trace: [Mon Feb 10 20:36:11 2025] page_pool_release_retry+0x23/0x70 [Mon Feb 10 20:36:11 2025] process_one_work+0x1b1/0x370 [Mon Feb 10 20:36:11 2025] worker_thread+0x37/0x3a0 [Mon Feb 10 20:36:11 2025] kthread+0x11a/0x140 [Mon Feb 10 20:36:11 2025] ? process_one_work+0x370/0x370 [Mon Feb 10 20:36:11 2025] ? __kthread_cancel_work+0x40/0x40 [Mon Feb 10 20:36:11 2025] ret_from_fork+0x35/0x40 [Mon Feb 10 20:36:11 2025] —[ end trace ebffe800f33e7e34 ]— Note: before this patch, the above calltrace would flood the dmesg due to repeated reschedule of release_dw kworker.

Affected Software

References

• https://git.kernel.org/stable/c/43130d02baa137033c25297aaae95fd0edc41654
• https://git.kernel.org/stable/c/7204335d1991c23fc615ab76f31f175748a578e1
• https://git.kernel.org/stable/c/738d1812ec2e395e953258aea912ddd867d11a13
• https://git.kernel.org/stable/c/90e089a64504982f8d62f223027cb9f903781f78
• https://git.kernel.org/stable/c/91522aba56e9fcdf64da25ffef9b27f8fad48e0f
• https://git.kernel.org/stable/c/95f17738b86fd198924d874a5639bcdc49c7e5b8
• https://git.kernel.org/stable/c/9f71db4fb82deb889e0bac4a51b34daea7d506a3
• https://git.kernel.org/stable/c/c3c7c57017ce1d4b2d3788c1fc59e7e39026e158
• https://git.kernel.org/stable/c/e74e5aa33228c5e2cb4fc80ad103541a7b7805ec