CVE-2026-93057scsi: ufs: core: Avoid possible memory reclaim deadlock in TX EQTR context

Official description

In the Linux kernel, the following vulnerability has been resolved: scsi: ufs: core: Avoid possible memory reclaim deadlock in TX EQTR context TX EQTR may run while devfreq gear scaling has quiesced the UFS tagset. In that context, functions ufshcd_tx_eqtr(), __ufshcd_tx_eqtr() and ufs_qcom_get_rx_fom() allocate memory with GFP_KERNEL. If direct reclaim is triggered, reclaim/writeback can depend on I/O to UFS device. Because the queue is quiesced, this can cause deadlock. Use memalloc_noio_save/restore() in ufshcd_tx_eqtr() to cover all allocations in the TX EQTR call tree, including: - params->eqtr_record in ufshcd_tx_eqtr() - eqtr_data in __ufshcd_tx_eqtr() - params in ufs_qcom_get_rx_fom() This is preferred over tagging individual call sites with GFP_NOIO, as it automatically covers any future allocations added anywhere in the call tree without requiring each caller to be aware of this constraint. [mkp: fix label as suggested by Bart]

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/a28a7d9b3bb116da788ae492c90465ec1a7fa6e8
• https://git.kernel.org/stable/c/760fc6f0e25a72832c2fcf37ecf5f1b770ec8374