Bug 1220623 (CVE-2021-46979) - VUL-0: CVE-2021-46979: kernel: iio: core: fix ioctl handlers removal
Summary: VUL-0: CVE-2021-46979: kernel: iio: core: fix ioctl handlers removal
Status: RESOLVED FIXED
Alias: CVE-2021-46979
Product: SUSE Security Incidents
Classification: Novell Products
Component: Incidents (show other bugs)
Version: unspecified
Hardware: Other Other
: P5 - None : Normal
Target Milestone: ---
Assignee: Kernel Bugs
QA Contact: Security Team bot
URL: https://smash.suse.de/issue/395428/
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Reported: 2024-02-29 09:01 UTC by SMASH SMASH
Modified: 2024-02-29 09:01 UTC (History)
1 user (show)

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Found By: Security Response Team
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Marketing QA Status: ---
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Description SMASH SMASH 2024-02-29 09:01:16 UTC 
In the Linux kernel, the following vulnerability has been resolved:

iio: core: fix ioctl handlers removal

Currently ioctl handlers are removed twice. For the first time during
iio_device_unregister() then later on inside
iio_device_unregister_eventset() and iio_buffers_free_sysfs_and_mask().
Double free leads to kernel panic.

Fix this by not touching ioctl handlers list directly but rather
letting code responsible for registration call the matching cleanup
routine itself.

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-46979
https://git.kernel.org/stable/c/ab6c935ba3a04317632f3b8b68675bdbaf395303
https://www.cve.org/CVERecord?id=CVE-2021-46979
https://git.kernel.org/stable/c/11e1cae5da4096552f7c091476cbadbc0d1817da
https://git.kernel.org/stable/c/901f84de0e16bde10a72d7eb2f2eb73fcde8fa1a