Bug 1225430 (CVE-2021-47519) - VUL-0: CVE-2021-47519: kernel: can: m_can: m_can_read_fifo: fix memory leak in error branch
Summary: VUL-0: CVE-2021-47519: kernel: can: m_can: m_can_read_fifo: fix memory leak i...
Status: RESOLVED FIXED
Alias: CVE-2021-47519
Product: SUSE Security Incidents
Classification: Novell Products
Component: Incidents (show other bugs)
Version: unspecified
Hardware: Other Other
: P3 - Medium : Normal
Target Milestone: ---
Assignee: Security Team bot
QA Contact: Security Team bot
URL: https://smash.suse.de/issue/407680/
Whiteboard: CVSSv3.1:SUSE:CVE-2021-47519:5.5:(AV:...
Keywords:
Depends on:
Blocks:
 
Reported: 2024-05-28 07:30 UTC by SMASH SMASH
Modified: 2024-05-29 10:41 UTC (History)
2 users (show)

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

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Description SMASH SMASH 2024-05-28 07:30:25 UTC 
In the Linux kernel, the following vulnerability has been resolved:

can: m_can: m_can_read_fifo: fix memory leak in error branch

In m_can_read_fifo(), if the second call to m_can_fifo_read() fails,
the function jump to the out_fail label and returns without calling
m_can_receive_skb(). This means that the skb previously allocated by
alloc_can_skb() is not freed. In other terms, this is a memory leak.

This patch adds a goto label to destroy the skb if an error occurs.

Issue was found with GCC -fanalyzer, please follow the link below for
details.

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-47519
https://www.cve.org/CVERecord?id=CVE-2021-47519
https://git.kernel.org/stable/c/31cb32a590d62b18f69a9a6d433f4e69c74fdd56
https://git.kernel.org/stable/c/75a422165477dd12d2d20aa7c9ee7c9a281c9908
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2021/CVE-2021-47519.mbox
https://bugzilla.redhat.com/show_bug.cgi?id=2283432
Comment 2 Andrea Mattiazzo 2024-05-29 10:41:12 UTC 
All done, closing.