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So the identical treatment must be applied to all DSA switch drivers, which happens to be: both use devres for both of those the mdiobus allocation and registration, or Never use devres at all. The felix driver has the code composition in place for orderly mdiobus removal, so just replace devm_mdiobus_alloc_size() with the non-devres variant, and insert manual free of charge the place required, to make certain we do not Enable devres absolutely free a continue to-registered bus.

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previous to commit 45bf39f8df7f ("USB: Main: Will not hold gadget lock although studying the "descriptors" sysfs file") this race could not take place, because the routines had been mutually exceptional due to the machine locking. Removing that locking from read_descriptors() exposed it towards the race. The best way to repair the bug is to maintain hub_port_init() from altering udev->descriptor at the time udev has become initialized and registered. Drivers anticipate the descriptors stored inside the kernel to be immutable; we should not undermine this expectation. In fact, this alteration should have been built way back. So now hub_port_init() will just take an additional argument, specifying a buffer by which to store the unit descriptor it reads. (If udev hasn't still been initialized, the buffer pointer might be NULL and after that hub_port_init() will store the device descriptor in udev as just before.) This eliminates the info race to blame for the out-of-bounds read. The alterations to hub_port_init() show up additional substantial than they really are, because of indentation changes resulting from an attempt to avoid crafting to other parts of the usb_device composition right after it has been initialized. equivalent changes must be made on the code that reads the BOS descriptor, but that could be managed within a different patch later on. This patch is ample to repair the bug discovered by syzbot.

inside the Linux kernel, the next vulnerability is resolved: drm/vc4: hdmi: Unregister codec machine on unbind On bind We'll register the HDMI codec gadget but we do not unregister it on unbind, bringing about a tool leakage. Unregister our product at unbind.

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This mapping entails bouncing by way of the swiotlb (we want swiotlb to do virtio in guarded guest like s390 Secure Execution, or AMD SEV). 4) if the SCSI TUR is finished, we initial copy again the material of the 2nd (that is definitely swiotlb) bounce buffer (which probably incorporates some preceding IO data), to the primary bounce buffer, which contains all zeros. Then we copy again the content material of the very first bounce buffer into the user-space buffer. five) The examination case detects that the buffer, which it zero-initialized, ain't all zeros and fails. One can argue that this is definitely an swiotlb dilemma, for the reason that without swiotlb we leak all zeros, as well as the swiotlb need to be transparent in a way that it does not influence the end result (if all other participants are very well behaved). Copying the material of the original buffer to the swiotlb buffer is the only way I can imagine to generate swiotlb transparent in these types of eventualities. So let's do just that if in doubt, but allow the motive force to inform us that The entire mapped buffer will be overwritten, during which scenario we could preserve the outdated behavior and avoid the overall performance impression of the additional bounce.

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So the exact same procedure must be placed on all DSA swap motorists, that's: both use devres for each the mdiobus allocation and registration, or Never use devres at all. The bcm_sf2 driver has the code structure in spot for orderly mdiobus elimination, so just exchange devm_mdiobus_alloc() with the non-devres variant, and incorporate guide no cost wherever needed, to make certain that we do not let devres absolutely free a still-registered bus.

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