[PATCH] virt: acrn: fix a memory leak in acrn_dev_ioctl()

Xiaolong Huang
2022-03-01T10:01:15Z

The vm_param and cpu_regs need to be freed via kfree() before return -EINVAL error.

Fixes: 9c5137aedd11 ("virt: acrn: Introduce VM management interfaces")
Fixes: 2ad2aaee1bc9 ("virt: acrn: Introduce an ioctl to set vCPU registers state")
Signed-off-by: Xiaolong Huang <butterflyhuangxx@gmail.com>
---
drivers/virt/acrn/hsm.c | 20 +++++++++++++++-----
1 file changed, 15 insertions(+), 5 deletions(-)

diff --git a/drivers/virt/acrn/hsm.c b/drivers/virt/acrn/hsm.c
index 5419794fccf1..423ea888d79a 100644
--- a/drivers/virt/acrn/hsm.c
+++ b/drivers/virt/acrn/hsm.c
@@ -136,8 +136,10 @@ static long acrn_dev_ioctl(struct file *filp, unsigned int cmd,
if (IS_ERR(vm_param))
return PTR_ERR(vm_param);

- if ((vm_param->reserved0 | vm_param->reserved1) != 0)
+ if ((vm_param->reserved0 | vm_param->reserved1) != 0) {
+ kfree(vm_param);
return -EINVAL;
+ }

vm = acrn_vm_create(vm, vm_param);
if (!vm) {
@@ -182,21 +184,29 @@ static long acrn_dev_ioctl(struct file *filp, unsigned int cmd,
return PTR_ERR(cpu_regs);

for (i = 0; i < ARRAY_SIZE(cpu_regs->reserved); i++)
- if (cpu_regs->reserved[i])
+ if (cpu_regs->reserved[i]) {
+ kfree(cpu_regs);
return -EINVAL;
+ }

for (i = 0; i < ARRAY_SIZE(cpu_regs->vcpu_regs.reserved_32); i++)
- if (cpu_regs->vcpu_regs.reserved_32[i])
+ if (cpu_regs->vcpu_regs.reserved_32[i]) {
+ kfree(cpu_regs);
return -EINVAL;
+ }

for (i = 0; i < ARRAY_SIZE(cpu_regs->vcpu_regs.reserved_64); i++)
- if (cpu_regs->vcpu_regs.reserved_64[i])
+ if (cpu_regs->vcpu_regs.reserved_64[i]) {
+ kfree(cpu_regs);
return -EINVAL;
+ }

for (i = 0; i < ARRAY_SIZE(cpu_regs->vcpu_regs.gdt.reserved); i++)
if (cpu_regs->vcpu_regs.gdt.reserved[i] |
- cpu_regs->vcpu_regs.idt.reserved[i])
+ cpu_regs->vcpu_regs.idt.reserved[i]) {
+ kfree(cpu_regs);
return -EINVAL;
+ }

ret = hcall_set_vcpu_regs(vm->vmid, virt_to_phys(cpu_regs));
if (ret < 0)
--
2.25.1