Bug 1220555 (CVE-2020-36778) - VUL-0: CVE-2020-36778: kernel: i2c: xiic: reference leak in xiic_xfer() and xiic_i2c_remove() when pm_runtime_get_sync fails()
Summary: VUL-0: CVE-2020-36778: kernel: i2c: xiic: reference leak in xiic_xfer() and x...
Status: RESOLVED FIXED
Alias: CVE-2020-36778
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/395415/
Whiteboard: CVSSv3.1:SUSE:CVE-2020-36778:4.7:(AV:...
Keywords:
Depends on:
Blocks:
 
Reported: 2024-02-28 12:26 UTC by SMASH SMASH
Modified: 2024-02-28 12:28 UTC (History)
1 user (show)

See Also:
Found By: Security Response Team
Services Priority:
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Blocker: ---
Marketing QA Status: ---
IT Deployment: ---

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Description SMASH SMASH 2024-02-28 12:26:27 UTC 
In the Linux kernel, the following vulnerability has been resolved:

i2c: xiic: fix reference leak when pm_runtime_get_sync fails

The PM reference count is not expected to be incremented on
return in xiic_xfer and xiic_i2c_remove.

However, pm_runtime_get_sync will increment the PM reference
count even failed. Forgetting to putting operation will result
in a reference leak here.

Replace it with pm_runtime_resume_and_get to keep usage
counter balanced.

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-36778
https://www.cve.org/CVERecord?id=CVE-2020-36778
https://git.kernel.org/stable/c/a42ac16e6573f19c78f556ea292f5b534fcc4514
https://git.kernel.org/stable/c/a85c5c7a3aa8041777ff691400b4046e56149fd3
https://git.kernel.org/stable/c/c977426db644ba476938125597947979e8aba725
https://git.kernel.org/stable/c/e2ba996577eaea423694dc69ae43d56f1410a22b
Comment 1 Carlos López 2024-02-28 12:27:07 UTC 
We have 10b17004a74c ("i2c: xiic: Fix the clocking across bind unbind") in cve/linux-5.14, SLE15-SP6, stable and master, all of which have the fix. Closing.