CVE-2021-47617 (GCVE-0-2021-47617)
Vulnerability from cvelistv5
Published
2024-06-20 10:57
Modified
2026-05-23 15:20
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: PCI: pciehp: Fix infinite loop in IRQ handler upon power fault The Power Fault Detected bit in the Slot Status register differs from all other hotplug events in that it is sticky: It can only be cleared after turning off slot power. Per PCIe r5.0, sec. 6.7.1.8: If a power controller detects a main power fault on the hot-plug slot, it must automatically set its internal main power fault latch [...]. The main power fault latch is cleared when software turns off power to the hot-plug slot. The stickiness used to cause interrupt storms and infinite loops which were fixed in 2009 by commits 5651c48cfafe ("PCI pciehp: fix power fault interrupt storm problem") and 99f0169c17f3 ("PCI: pciehp: enable software notification on empty slots"). Unfortunately in 2020 the infinite loop issue was inadvertently reintroduced by commit 8edf5332c393 ("PCI: pciehp: Fix MSI interrupt race"): The hardirq handler pciehp_isr() clears the PFD bit until pciehp's power_fault_detected flag is set. That happens in the IRQ thread pciehp_ist(), which never learns of the event because the hardirq handler is stuck in an infinite loop. Fix by setting the power_fault_detected flag already in the hardirq handler.
References
Impacted products
Vendor Product Version
Linux Linux Version: a8cc52270f3d8e8f4faf01ffd6c4a95bbfb55ba4
Version: 4667358dab9cc07da044d5bc087065545b1000df
Version: 8edf5332c39340b9583cf9cba659eb7ec71f75b5
Version: 8edf5332c39340b9583cf9cba659eb7ec71f75b5
Version: 8edf5332c39340b9583cf9cba659eb7ec71f75b5
Version: 8edf5332c39340b9583cf9cba659eb7ec71f75b5
Version: 4.19.149   ≤
Version: 5.4.69   ≤
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