CVE-2024-39462: clk: bcm: dvp: Assign ->num before accessing ->hws
First published: Tue Jun 25 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: clk: bcm: dvp: Assign ->num before accessing ->hws Commit f316cdff8d67 ("clk: Annotate struct clk_hw_onecell_data with __counted_by") annotated the hws member of 'struct clk_hw_onecell_data' with __counted_by, which informs the bounds sanitizer about the number of elements in hws, so that it can warn when hws is accessed out of bounds. As noted in that change, the __counted_by member must be initialized with the number of elements before the first array access happens, otherwise there will be a warning from each access prior to the initialization because the number of elements is zero. This occurs in clk_dvp_probe() due to ->num being assigned after ->hws has been accessed: UBSAN: array-index-out-of-bounds in drivers/clk/bcm/clk-bcm2711-dvp.c:59:2 index 0 is out of range for type 'struct clk_hw *[] __counted_by(num)' (aka 'struct clk_hw *[]') Move the ->num initialization to before the first access of ->hws, which clears up the warning.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=6.6<6.6.34 | |
| Linux Kernel | >=6.7<6.9.5 | |
| debian/linux | 5.10.223-1 5.10.234-1 6.1.129-1 6.1.133-1 6.12.21-1 6.12.22-1 |
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Reference Links
- https://git.kernel.org/stable/c/0dc913217fb79096597005bba9ba738e2db5cd02
- https://git.kernel.org/stable/c/9368cdf90f52a68120d039887ccff74ff33b4444
- https://git.kernel.org/stable/c/a1dd92fca0d6b58b55ed0484f75d4205dbb77010
- https://git.kernel.org/linus/9368cdf90f52a68120d039887ccff74ff33b4444
- https://security-tracker.debian.org/tracker/CVE-2024-39462
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-39462
- https://nvd.nist.gov/vuln/detail/CVE-2024-39462
- https://launchpad.net/bugs/cve/CVE-2024-39462
- https://ubuntu.com/security/CVE-2024-39462
Frequently Asked Questions
What is the severity of CVE-2024-39462?
CVE-2024-39462 is classified as a medium severity vulnerability in the Linux kernel.
What software versions are affected by CVE-2024-39462?
CVE-2024-39462 affects Linux kernel versions 5.10.223-1, 5.10.226-1, 6.1.123-1, 6.1.128-1, 6.12.12-1, and 6.12.13-1.
How do I fix CVE-2024-39462?
To mitigate CVE-2024-39462, upgrade to an unaffected version of the Linux kernel.
What components of the Linux kernel does CVE-2024-39462 impact?
CVE-2024-39462 impacts the clk subsystem and specifically the struct clk_hw_onecell_data.
Was CVE-2024-39462 publicly disclosed?
CVE-2024-39462 was resolved through a kernel commit and is documented in the Linux kernel change logs.
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