Bug 2360784 (CVE-2021-47671)

Summary: CVE-2021-47671 kernel: can: etas_es58x: es58x_rx_err_msg(): fix memory leak in error path
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: low    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Description OSIDB Bzimport 2025-04-17 19:01:26 UTC 
In the Linux kernel, the following vulnerability has been resolved:

can: etas_es58x: es58x_rx_err_msg(): fix memory leak in error path

In es58x_rx_err_msg(), if can->do_set_mode() fails, the function
directly returns without calling netif_rx(skb). This means that the
skb previously allocated by alloc_can_err_skb() is not freed. In other
terms, this is a memory leak.

This patch simply removes the return statement in the error branch and
let the function continue.

Issue was found with GCC -fanalyzer, please follow the link below for
details.
Comment 1 Avinash Hanwate 2025-04-18 04:01:39 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025041735-CVE-2021-47671-9b1a@gregkh/T