From: Kunwu Chan chentao@kylinos.cn

stable inclusion from stable-v5.10.214 commit eb279074badac0bbe28749906562d648ca4bc750 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9HK0E CVE: CVE-2024-26908

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...

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[ Upstream commit 3693bb4465e6e32a204a5b86d3ec7e6b9f7e67c2 ]

kasprintf() returns a pointer to dynamically allocated memory which can be NULL upon failure. Ensure the allocation was successful by checking the pointer validity.

Signed-off-by: Kunwu Chan chentao@kylinos.cn Reported-by: kernel test robot lkp@intel.com Closes: https://lore.kernel.org/oe-kbuild-all/202401161119.iof6BQsf-lkp@intel.com/ Suggested-by: Markus Elfring Markus.Elfring@web.de Reviewed-by: Juergen Gross jgross@suse.com Link: https://lore.kernel.org/r/20240119094948.275390-1-chentao@kylinos.cn Signed-off-by: Juergen Gross jgross@suse.com Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Yuntao Liu liuyuntao12@huawei.com --- arch/x86/xen/smp.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)

diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c index cdec892b28e2..a641e0d45219 100644 --- a/arch/x86/xen/smp.c +++ b/arch/x86/xen/smp.c @@ -65,6 +65,8 @@ int xen_smp_intr_init(unsigned int cpu) char *resched_name, *callfunc_name, *debug_name;

resched_name = kasprintf(GFP_KERNEL, "resched%d", cpu); + if (!resched_name) + goto fail_mem; per_cpu(xen_resched_irq, cpu).name = resched_name; rc = bind_ipi_to_irqhandler(XEN_RESCHEDULE_VECTOR, cpu, @@ -77,6 +79,8 @@ int xen_smp_intr_init(unsigned int cpu) per_cpu(xen_resched_irq, cpu).irq = rc;

callfunc_name = kasprintf(GFP_KERNEL, "callfunc%d", cpu); + if (!callfunc_name) + goto fail_mem; per_cpu(xen_callfunc_irq, cpu).name = callfunc_name; rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_VECTOR, cpu, @@ -90,6 +94,9 @@ int xen_smp_intr_init(unsigned int cpu)

if (!xen_fifo_events) { debug_name = kasprintf(GFP_KERNEL, "debug%d", cpu); + if (!debug_name) + goto fail_mem; + per_cpu(xen_debug_irq, cpu).name = debug_name; rc = bind_virq_to_irqhandler(VIRQ_DEBUG, cpu, xen_debug_interrupt, @@ -101,6 +108,9 @@ int xen_smp_intr_init(unsigned int cpu) }

callfunc_name = kasprintf(GFP_KERNEL, "callfuncsingle%d", cpu); + if (!callfunc_name) + goto fail_mem; + per_cpu(xen_callfuncsingle_irq, cpu).name = callfunc_name; rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_SINGLE_VECTOR, cpu, @@ -114,6 +124,8 @@ int xen_smp_intr_init(unsigned int cpu)

return 0;

+ fail_mem: + rc = -ENOMEM; fail: xen_smp_intr_free(cpu); return rc;