Bug 2324329 (CVE-2024-50145)

Summary: CVE-2024-50145 kernel: octeon_ep: Add SKB allocation failures handling in __octep_oq_process_rx()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
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Hardware: All   
OS: Linux   
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Bug Depends On: 2324389    
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Description OSIDB Bzimport 2024-11-07 10:02:14 UTC 
In the Linux kernel, the following vulnerability has been resolved:

octeon_ep: Add SKB allocation failures handling in __octep_oq_process_rx()

build_skb() returns NULL in case of a memory allocation failure so handle
it inside __octep_oq_process_rx() to avoid NULL pointer dereference.

__octep_oq_process_rx() is called during NAPI polling by the driver. If
skb allocation fails, keep on pulling packets out of the Rx DMA queue: we
shouldn't break the polling immediately and thus falsely indicate to the
octep_napi_poll() that the Rx pressure is going down. As there is no
associated skb in this case, don't process the packets and don't push them
up the network stack - they are skipped.

Helper function is implemented to unmmap/flush all the fragment buffers
used by the dropped packet. 'alloc_failures' counter is incremented to
mark the skb allocation error in driver statistics.

Found by Linux Verification Center (linuxtesting.org) with SVACE.
Comment 1 Robb Gatica 2024-11-07 15:58:52 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024110744-CVE-2024-50145-10b6@gregkh/T