iio: health: afe4404: Fix oob read in afe4404_[read|write]_raw

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: iio: health: afe4404: Fix oob read in afe4404_[read|write]_raw KASAN report out-of-bounds read as follows: BUG: KASAN: global-out-of-bounds in afe4404_read_raw+0x2ce/0x380 Read of size 4 at addr ffffffffc00e4658 by task cat/278 Call Trace: afe4404_read_raw iio_read_channel_info dev_attr_show The buggy address belongs to the variable: afe4404_channel_leds+0x18/0xffffffffffffe9c0 This issue can be reproduce by singe command: $ cat /sys/bus/i2c/devices/0-0058/iio\:device0/in_intensity6_raw The array size of afe4404_channel_leds and afe4404_channel_offdacs are less than channels, so access with chan->address cause OOB read in afe4404_[read|write]_raw. Fix it by moving access before use them.

References

• https://git.kernel.org/stable/c/68de7da092f38395dde523f2e5db26eba6c23e28
• https://git.kernel.org/stable/c/113c08030a89aaf406f8a1d4549d758a67c2afba
• https://git.kernel.org/stable/c/f5575041ec15310bdc50c42b8b22118cc900226e
• https://git.kernel.org/stable/c/3f566b626029ca8598d48e5074e56bb37399ca1b
• https://git.kernel.org/stable/c/5eb114f55b37dbc0487aa9c1913b81bb7837f1c4
• https://git.kernel.org/stable/c/f7419fc42afc035f6b29ce713e17dcd2000c833f
• https://git.kernel.org/stable/c/d45d9f45e7b1365fd0d9bf14680d6d5082a590d1
• https://git.kernel.org/stable/c/fc92d9e3de0b2d30a3ccc08048a5fad533e4672b