hwmon: (w83791d) Fix NULL pointer dereference by removing unnecessary structure field

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: hwmon: (w83791d) Fix NULL pointer dereference by removing unnecessary structure field If driver read val value sufficient for (val & 0x08) && (!(val & 0x80)) && ((val & 0x7) == ((val >> 4) & 0x7)) from device then Null pointer dereference occurs. (It is possible if tmp = 0b0xyz1xyz, where same literals mean same numbers) Also lm75[] does not serve a purpose anymore after switching to devm_i2c_new_dummy_device() in w83791d_detect_subclients(). The patch fixes possible NULL pointer dereference by removing lm75[]. Found by Linux Driver Verification project (linuxtesting.org). [groeck: Dropped unnecessary continuation lines, fixed multi-line alignment]

References

• https://git.kernel.org/stable/c/44d3c480e4e2a75bf6296a18b4356157991ccd80
• https://git.kernel.org/stable/c/516d9055039017a20a698103be2b556b4c976bb8
• https://git.kernel.org/stable/c/16887ae4e3defd2c4e7913b6c539f33eaf4eac5c
• https://git.kernel.org/stable/c/943c15ac1b84d378da26bba41c83c67e16499ac4