In the Linux kernel, the following vulnerability has been resolved:

iio: adc: spear: Initialize completion before requesting IRQ

In the report from Jaeyoung Chung:

"spear_adc_probe() in drivers/iio/adc/spear_adc.c registers its
interrupt handler with devm_request_irq() before it initializes
st->completion with init_completion(). If an interrupt arrives after
devm_request_irq() and before init_completion(), the handler calls
complete() on an uninitialized completion, causing a kernel panic.

The probe path, in spear_adc_probe():

    iodev = devm_iio_device_alloc(&pdev->dev, sizeof(*st)); /* st kzalloc-zeroed */
    ...
    retval = devm_request_irq(&pdev->dev, irq, spear_adc_isr, 0,
                              LPC32XXAD_NAME, st);           /* register handler */
    ...
    init_completion(&st->completion);                       /* initialize completion */

spear_adc_isr() calls complete():

    complete(&st->completion);

If the device raises an interrupt before init_completion() runs,
complete() acquires the uninitialized wait.lock and walks the zeroed
task_list in swake_up_locked(). The zeroed task_list makes list_empty()
return false, so swake_up_locked() dereferences a NULL list entry,
triggering a KASAN wild-memory-access."

Fix the chance of a spurious IRQ causing an uninitialized pointer
dereference by moving init_completion() above devm_request_irq().

https://git.kernel.org/stable/c/37077d8271b1f24894fbc21bca1c4cd337525d31

https://git.kernel.org/stable/c/3ee2128b6f0eb0be7b6cb8f6e0f1f113a65201a0

https://git.kernel.org/stable/c/67a49ab41320b3f721ce4be7447754ff040acbd5

https://git.kernel.org/stable/c/a50757398794aaa25f908b96c6733e045466cba4

https://git.kernel.org/stable/c/aea8ae6c4d3ed58d9223360f758df6bd8b90c608

https://git.kernel.org/stable/c/bbfebae473ac2c8a194523b29ccb9b45f02f134c

https://git.kernel.org/stable/c/eb5b07c9d0ec1a9d4b6871b14793c19967d79dc4

https://git.kernel.org/stable/c/f3f90bc7b38ba3ff14f131cea0f8eb77624787a8

[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","programFiles":["drivers/iio/adc/spear_adc.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","versions":[{"version":"b586e5d9eee038b8ee6f846cdb6cf2fcbcb2f4ed","lessThan":"aea8ae6c4d3ed58d9223360f758df6bd8b90c608","versionType":"git","status":"affected"},{"version":"b586e5d9eee038b8ee6f846cdb6cf2fcbcb2f4ed","lessThan":"67a49ab41320b3f721ce4be7447754ff040acbd5","versionType":"git","status":"affected"},{"version":"b586e5d9eee038b8ee6f846cdb6cf2fcbcb2f4ed","lessThan":"a50757398794aaa25f908b96c6733e045466cba4","versionType":"git","status":"affected"},{"version":"b586e5d9eee038b8ee6f846cdb6cf2fcbcb2f4ed","lessThan":"f3f90bc7b38ba3ff14f131cea0f8eb77624787a8","versionType":"git","status":"affected"},{"version":"b586e5d9eee038b8ee6f846cdb6cf2fcbcb2f4ed","lessThan":"37077d8271b1f24894fbc21bca1c4cd337525d31","versionType":"git","status":"affected"},{"version":"b586e5d9eee038b8ee6f846cdb6cf2fcbcb2f4ed","lessThan":"bbfebae473ac2c8a194523b29ccb9b45f02f134c","versionType":"git","status":"affected"},{"version":"b586e5d9eee038b8ee6f846cdb6cf2fcbcb2f4ed","lessThan":"eb5b07c9d0ec1a9d4b6871b14793c19967d79dc4","versionType":"git","status":"affected"},{"version":"b586e5d9eee038b8ee6f846cdb6cf2fcbcb2f4ed","lessThan":"3ee2128b6f0eb0be7b6cb8f6e0f1f113a65201a0","versionType":"git","status":"affected"}]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","programFiles":["drivers/iio/adc/spear_adc.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","versions":[{"version":"3.16","status":"affected"},{"version":"0","lessThan":"3.16","versionType":"semver","status":"unaffected"},{"version":"5.10.261","lessThanOrEqual":"5.10.*","versionType":"semver","status":"unaffected"},{"version":"5.15.212","lessThanOrEqual":"5.15.*","versionType":"semver","status":"unaffected"},{"version":"6.1.178","lessThanOrEqual":"6.1.*","versionType":"semver","status":"unaffected"},{"version":"6.6.145","lessThanOrEqual":"6.6.*","versionType":"semver","status":"unaffected"},{"version":"6.12.96","lessThanOrEqual":"6.12.*","versionType":"semver","status":"unaffected"},{"version":"6.18.39","lessThanOrEqual":"6.18.*","versionType":"semver","status":"unaffected"},{"version":"7.1.4","lessThanOrEqual":"7.1.*","versionType":"semver","status":"unaffected"},{"version":"7.2-rc3","lessThanOrEqual":"*","versionType":"original_commit_for_fix","status":"unaffected"}]}]