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(unknown [172.20.15.234]) by mail.kylinos.cn (NSMail) with ESMTPA id F1FC7E000EB9; Fri, 19 Jan 2024 17:49:50 +0800 (CST) From: Kunwu Chan To: jgross@suse.com, boris.ostrovsky@oracle.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com Cc: xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org, Kunwu Chan , kernel test robot , Markus Elfring Subject: [PATCH v3] x86/xen: Add some null pointer checking to smp.c Date: Fri, 19 Jan 2024 17:49:48 +0800 Message-Id: <20240119094948.275390-1-chentao@kylinos.cn> X-Mailer: git-send-email 2.39.2 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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 Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202401161119.iof6BQsf-lkp@int= el.com/ Suggested-by: Markus Elfring Reviewed-by: Juergen Gross --- Changes in v3: - Remove rc initialization - Simply error paths by adding a new label 'fail_mem' Changes in v2: - Initial rc and return errno in error paths --- 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 4b0d6fff88de..1fb9a1644d94 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; =20 resched_name =3D kasprintf(GFP_KERNEL, "resched%d", cpu); + if (!resched_name) + goto fail_mem; per_cpu(xen_resched_irq, cpu).name =3D resched_name; rc =3D 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 =3D rc; =20 callfunc_name =3D kasprintf(GFP_KERNEL, "callfunc%d", cpu); + if (!callfunc_name) + goto fail_mem; per_cpu(xen_callfunc_irq, cpu).name =3D callfunc_name; rc =3D bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_VECTOR, cpu, @@ -90,6 +94,9 @@ int xen_smp_intr_init(unsigned int cpu) =20 if (!xen_fifo_events) { debug_name =3D kasprintf(GFP_KERNEL, "debug%d", cpu); + if (!debug_name) + goto fail_mem; + per_cpu(xen_debug_irq, cpu).name =3D debug_name; rc =3D bind_virq_to_irqhandler(VIRQ_DEBUG, cpu, xen_debug_interrupt, @@ -101,6 +108,9 @@ int xen_smp_intr_init(unsigned int cpu) } =20 callfunc_name =3D kasprintf(GFP_KERNEL, "callfuncsingle%d", cpu); + if (!callfunc_name) + goto fail_mem; + per_cpu(xen_callfuncsingle_irq, cpu).name =3D callfunc_name; rc =3D bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_SINGLE_VECTOR, cpu, @@ -114,6 +124,8 @@ int xen_smp_intr_init(unsigned int cpu) =20 return 0; =20 + fail_mem: + rc =3D -ENOMEM; fail: xen_smp_intr_free(cpu); return rc; --=20 2.39.2