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CVE-2023-52749

Disclosure Date: May 21, 2024
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Description

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

spi: Fix null dereference on suspend

A race condition exists where a synchronous (noqueue) transfer can be
active during a system suspend. This can cause a null pointer
dereference exception to occur when the system resumes.

Example order of events leading to the exception:

  1. spi_sync() calls __spi_transfer_message_noqueue() which sets
    ctlr->cur_msg
  2. Spi transfer begins via spi_transfer_one_message()
  3. System is suspended interrupting the transfer context
  4. System is resumed
  5. spi_controller_resume() calls spi_start_queue() which resets cur_msg
    to NULL
  6. Spi transfer context resumes and spi_finalize_current_message() is
    called which dereferences cur_msg (which is now NULL)

Wait for synchronous transfers to complete before suspending by
acquiring the bus mutex and setting/checking a suspend flag.

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CVSS V3 Severity and Metrics
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General Information

Vendors

  • Linux

Products

  • Linux

Additional Info

Technical Analysis