Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 5bc493bf0c37c157bf2eb364e55a1c6f8bc43a69 before 6cf600b276a55a6481462830607a611f32e737c0; affected 5bc493bf0c37c157bf2eb364e55a1c6f8bc43a69 before 5bd8e897ecf558507142f4553e4526adfc1d6482; affected 5bc493bf0c37c157bf2eb364e55a1c6f8bc43a69 before 00268f9452d2a0d660aa9c1bb0ca07a994af6a4f |
| Linux / Linux | affected 6.14; unaffected 0 before 6.14; unaffected 6.18.46 through 6.18.*; unaffected 7.1.10 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.