iio: health: afe4403: Fix oob read in afe4403_read_raw

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: iio: health: afe4403: Fix oob read in afe4403_read_raw KASAN report out-of-bounds read as follows: BUG: KASAN: global-out-of-bounds in afe4403_read_raw+0x42e/0x4c0 Read of size 4 at addr ffffffffc02ac638 by task cat/279 Call Trace: afe4403_read_raw iio_read_channel_info dev_attr_show The buggy address belongs to the variable: afe4403_channel_leds+0x18/0xffffffffffffe9e0 This issue can be reproduced by singe command: $ cat /sys/bus/spi/devices/spi0.0/iio\:device0/in_intensity6_raw The array size of afe4403_channel_leds is less than channels, so access with chan->address cause OOB read in afe4403_read_raw. Fix it by moving access before use it.

References

• https://git.kernel.org/stable/c/98afcb5f3be645d330c74c5194ba0d80e26f95e0
• https://git.kernel.org/stable/c/c9268df36818ee4eaaaeadc80009b442a5ca69c9
• https://git.kernel.org/stable/c/726fa3e4ab97dcff1c745bdc4fb137366cb8d3df
• https://git.kernel.org/stable/c/2d6a437064ffbe685c67ddb16dfc0946074c6c3f
• https://git.kernel.org/stable/c/b1756af172fb80a3edc143772d49e166ec691b6c
• https://git.kernel.org/stable/c/e7e76a77aabef8989cbc0a8417af1aa040620867
• https://git.kernel.org/stable/c/06c6ce21cec77dfa860d57e7a006000a57812efb
• https://git.kernel.org/stable/c/58143c1ed5882c138a3cd2251a336fc8755f23d9