CVE-2022-50558

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> regmap-irq: Use the new num_config_regs property in regmap_add_irq_chip_fwnode<br /> <br /> Commit faa87ce9196d ("regmap-irq: Introduce config registers for irq<br /> types") added the num_config_regs, then commit 9edd4f5aee84 ("regmap-irq:<br /> Deprecate type registers and virtual registers") suggested to replace<br /> num_type_reg with it. However, regmap_add_irq_chip_fwnode wasn&amp;#39;t modified<br /> to use the new property. Later on, commit 255a03bb1bb3 ("ASoC: wcd9335:<br /> Convert irq chip to config regs") removed the old num_type_reg property<br /> from the WCD9335 driver&amp;#39;s struct regmap_irq_chip, causing a null pointer<br /> dereference in regmap_irq_set_type when it tried to index d-&gt;type_buf as<br /> it was never allocated in regmap_add_irq_chip_fwnode:<br /> <br /> [ 39.199374] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000<br /> <br /> [ 39.200006] Call trace:<br /> [ 39.200014] regmap_irq_set_type+0x84/0x1c0<br /> [ 39.200026] __irq_set_trigger+0x60/0x1c0<br /> [ 39.200040] __setup_irq+0x2f4/0x78c<br /> [ 39.200051] request_threaded_irq+0xe8/0x1a0<br /> <br /> Use num_config_regs in regmap_add_irq_chip_fwnode instead of num_type_reg,<br /> and fall back to it if num_config_regs isn&amp;#39;t defined to maintain backward<br /> compatibility.