CVE-2025-71285

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

net: qrtr: Drop the MHI auto_queue feature for IPCR DL channels

MHI stack offers the 'auto_queue' feature, which allows the MHI stack to

auto queue the buffers for the RX path (DL channel). Though this feature

simplifies the client driver design, it introduces race between the client

drivers and the MHI stack. For instance, with auto_queue, the 'dl_callback'

for the DL channel may get called before the client driver is fully probed.

This means, by the time the dl_callback gets called, the client driver's

structures might not be initialized, leading to NULL ptr dereference.

Currently, the drivers have to workaround this issue by initializing the

internal structures before calling mhi_prepare_for_transfer_autoqueue().

But even so, there is a chance that the client driver's internal code path

may call the MHI queue APIs before mhi_prepare_for_transfer_autoqueue() is

called, leading to similar NULL ptr dereference. This issue has been

reported on the Qcom X1E80100 CRD machines affecting boot.

So to properly fix all these races, drop the MHI 'auto_queue' feature

altogether and let the client driver (QRTR) manage the RX buffers manually.

In the QRTR driver, queue the RX buffers based on the ring length during

probe and recycle the buffers in 'dl_callback' once they are consumed. This

also warrants removing the setting of 'auto_queue' flag from controller

drivers.

Currently, this 'auto_queue' feature is only enabled for IPCR DL channel.

So only the QRTR client driver requires the modification.