scsi: core: ufs: Fix a hang in the error handler

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: scsi: core: ufs: Fix a hang in the error handler ufshcd_err_handling_prepare() calls ufshcd_rpm_get_sync(). The latter function can only succeed if UFSHCD_EH_IN_PROGRESS is not set because resuming involves submitting a SCSI command and ufshcd_queuecommand() returns SCSI_MLQUEUE_HOST_BUSY if UFSHCD_EH_IN_PROGRESS is set. Fix this hang by setting UFSHCD_EH_IN_PROGRESS after ufshcd_rpm_get_sync() has been called instead of before. Backtrace: __switch_to+0x174/0x338 __schedule+0x600/0x9e4 schedule+0x7c/0xe8 schedule_timeout+0xa4/0x1c8 io_schedule_timeout+0x48/0x70 wait_for_common_io+0xa8/0x160 //waiting on START_STOP wait_for_completion_io_timeout+0x10/0x20 blk_execute_rq+0xe4/0x1e4 scsi_execute_cmd+0x108/0x244 ufshcd_set_dev_pwr_mode+0xe8/0x250 __ufshcd_wl_resume+0x94/0x354 ufshcd_wl_runtime_resume+0x3c/0x174 scsi_runtime_resume+0x64/0xa4 rpm_resume+0x15c/0xa1c __pm_runtime_resume+0x4c/0x90 // Runtime resume ongoing ufshcd_err_handler+0x1a0/0xd08 process_one_work+0x174/0x808 worker_thread+0x15c/0x490 kthread+0xf4/0x1ec ret_from_fork+0x10/0x20 [ bvanassche: rewrote patch description ]

References

• https://git.kernel.org/stable/c/f210ea4e7a790c9f5e613e5302175abd539fe9d5
• https://git.kernel.org/stable/c/f592eb12b43f21dbc972cbe583a12d256901e569
• https://git.kernel.org/stable/c/ded80255c59a57cd3270d98461f6508730f9767c
• https://git.kernel.org/stable/c/21f071261f946c5ca1adf378f818082a112b34d2
• https://git.kernel.org/stable/c/3464a707d137efc8aea1d4ae234d26a28d82b78c
• https://git.kernel.org/stable/c/bb37f795d01961286b8f768a6d7152f32b589067
• https://git.kernel.org/stable/c/8a3514d348de87a9d5e2ac00fbac4faae0b97996