جزئیات آسیب‌پذیری

In the Linux kernel, the following vulnerability has been resolved: powerpc/xive: propagate IPI init errors to prevent use-after-free When xive_init_ipis() fails (e.g. irq_domain_alloc_irqs() fails), the error path frees the global xive_ipis array. However, xive_smp_probe() previously ignored this failure and proceeded to call xive_setup_cpu_ipi(), which dereferences the already-freed xive_ipis pointer -- a use-after-free. Now that xive_smp_probe() returns int (previous patch), propagate the error from xive_init_ipis() and xive_setup_cpu_ipi() through xive_smp_probe(). Check the return value in both pnv_smp_probe() and pSeries_smp_probe() so that IPI setup is aborted cleanly on failure, avoiding the use-after-free.

• https://git.kernel.org/stable/c/89e1caa5b0aafe23e9938d9a311e9d41baee583e
• https://git.kernel.org/stable/c/e36b1c2eafcaaddefa70d55e6fda74cf6cda38af
• https://git.kernel.org/stable/c/2ea6238343691309e68308131c7e80c3ae05afea
• https://git.kernel.org/stable/c/5c9ab0c9cede9f149733d330e2d7d45341b71359
• https://git.kernel.org/stable/c/c554a8d376d5aea1b237ed6bef6f9fbfc550e67f
• https://git.kernel.org/stable/c/411a3c016e7a95f5fa105a0587e07d0647a77727