Description
In the Linux kernel, the following vulnerability has been resolved: regmap: sdw-mbq: don't call an unset readable_reg callback regmap_sdw_mbq_poll_busy() decides whether to poll the Function Busy bit by calling ctx->readable_reg(), which is a straight copy of config->readable_reg. That callback is optional: regmap_readable() treats a NULL ->readable_reg as "every register is readable", and drivers rely on that. es9356 and tac5xx2-sdw both build an MBQ regmap without one. Since commit ca1b11b36d82 ("regmap: sdw-mbq: Allow defers on undeferrable controls") the poll runs on every -ENODATA, not only for Controls the driver marked deferrable, so any of those devices answering COMMAND_IGNORED takes the kernel through a NULL function pointer. Treat a missing callback the way the rest of regmap does and poll.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
5bc493bf0c37c157bf2eb364e55a1c6f8bc43a69 to < 6cf600b276a55a6481462830607a611f32e737c0affected5bc493bf0c37c157bf2eb364e55a1c6f8bc43a69 to < 5bd8e897ecf558507142f4553e4526adfc1d6482affected5bc493bf0c37c157bf2eb364e55a1c6f8bc43a69 to < 00268f9452d2a0d660aa9c1bb0ca07a994af6a4faffected
Linux Linux
Default version status: affected
6.14affected0 to < 6.14unaffected6.18.46 to ≤ 6.18.*unaffected7.1.10 to ≤ 7.1.*unaffected7.2 to ≤ *unaffected