[PATCH AUTOSEL 5.4 3/5] x86/xen: Add some null pointer checking to smp.c

[Sasha Levin <sashal@xxxxxxxxxx>]

From: Kunwu Chan <chentao@xxxxxxxxxx>

[ 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@xxxxxxxxxx>
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Closes: 
https://lore.kernel.org/oe-kbuild-all/202401161119.iof6BQsf-lkp@xxxxxxxxx/
Suggested-by: Markus Elfring <Markus.Elfring@xxxxxx>
Reviewed-by: Juergen Gross <jgross@xxxxxxxx>
Link: https://lore.kernel.org/r/20240119094948.275390-1-chentao@xxxxxxxxxx
Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 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 a1cc855c539c1..a76ba342a6695 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;
-- 
2.43.0