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If\nskb allocation fails, keep on pulling packets out of the Rx DMA queue: we\nshouldn't break the polling immediately and thus falsely indicate to the\noctep_napi_poll() that the Rx pressure is going down. As there is no\nassociated skb in this case, don't process the packets and don't push them\nup the network stack - they are skipped.\n\nHelper function is implemented to unmmap/flush all the fragment buffers\nused by the dropped packet. 'alloc_failures' counter is incremented to\nmark the skb allocation error in driver statistics.\n\nFound by Linux Verification Center (linuxtesting.org) with SVACE."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: octeon_ep: Agregar manejo de fallas de asignaci\u00f3n de SKB en __octep_oq_process_rx() build_skb() devuelve NULL en caso de una falla de asignaci\u00f3n de memoria, por lo que se maneja dentro de __octep_oq_process_rx() para evitar la desreferencia del puntero NULL. __octep_oq_process_rx() es llamado durante el sondeo NAPI por el controlador. Si la asignaci\u00f3n de skb falla, sigue extrayendo paquetes de la cola DMA de Rx: no deber\u00edamos interrumpir el sondeo inmediatamente y, por lo tanto, indicar falsamente a octep_napi_poll() que la presi\u00f3n de Rx est\u00e1 disminuyendo. Como no hay un skb asociado en este caso, no procesa los paquetes y no los empuja hacia arriba en la pila de red: se omiten. Se implementa una funci\u00f3n auxiliar para desmapear/vaciar todos los buferes de fragmentos utilizados por el paquete descartado. El contador 'alloc_failures' se incrementa para marcar el error de asignaci\u00f3n de skb en las estad\u00edsticas del controlador. 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{"bugzilla": {"description": "kernel: octeon_ep: Add SKB allocation failures handling in __octep_oq_process_rx()", "id": "2324329", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2324329"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-476", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nocteon_ep: Add SKB allocation failures handling in __octep_oq_process_rx()\nbuild_skb() returns NULL in case of a memory allocation failure so handle\nit inside __octep_oq_process_rx() to avoid NULL pointer dereference.\n__octep_oq_process_rx() is called during NAPI polling by the driver. If\nskb allocation fails, keep on pulling packets out of the Rx DMA queue: we\nshouldn't break the polling immediately and thus falsely indicate to the\noctep_napi_poll() that the Rx pressure is going down. As there is no\nassociated skb in this case, don't process the packets and don't push them\nup the network stack - they are skipped.\nHelper function is implemented to unmmap/flush all the fragment buffers\nused by the dropped packet. 'alloc_failures' counter is incremented to\nmark the skb allocation error in driver statistics.\nFound by Linux Verification Center (linuxtesting.org) with SVACE."], "name": "CVE-2024-50145", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Will not fix", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-11-07T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-50145\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-50145\nhttps://lore.kernel.org/linux-cve-announce/2024110744-CVE-2024-50145-10b6@gregkh/T"], "threat_severity": "Moderate"}

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