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

[Li Fei1]

On Tue, Jan 04, 2022 at 08:37:27AM +0100, Greg KH wrote:
> On Tue, Jan 04, 2022 at 11:50:33AM +0800, Li Fei1 wrote:
> > On Tue, Jan 04, 2022 at 11:45:01AM +0800, Zhou Qingyang wrote:
> > > In acrn_dev_ioctl(), vm_param is not released or passed out on the 
> > > error path of "if ((vm_param->reserved0 | vm_param->reserved1) != 0)", 
> > > which could lead to a memory leak.
> > > 
> > > Fix this bug by adding a kfree of vm_param on the error path.
> > > 
> > > This bug was found by a static analyzer.
> > > 
> > > Builds with CONFIG_ACRN_GUEST=y, CONFIG_ACRN_HSM=y show no new warnings, 
> > > and our static analyzer no longer warns about this code.
> > > 
> > > Fixes: 9c5137aedd11 (“9c5137aedd11 virt: acrn: Introduce VM management interfaces”)
> > > Signed-off-by: Zhou Qingyang <zhou1615@xxxxxxx>
> > > ---
> > > The analysis employs differential checking to identify inconsistent
> > > security operations (e.g., checks or kfrees) between two code paths
> > > and confirms that the inconsistent operations are not recovered in 
> > > the current function or the callers, so they constitute bugs. 
> > > 
> > > Note that, as a bug found by static analysis, it can be a false
> > > positive or hard to trigger. Multiple researchers have cross-reviewed
> > > the bug.
> > > 
> > > Changes in v2:
> > >   -  Fix the same bug in ACRN_IOCTL_SET_VCPU_REGS.
> > > 
> > 
> > Signed-off-by: Fei Li <fei1.li@xxxxxxxxx>
> 
> For the multiple obvious reasons (not the least being you didn't even
> run it through our normal testing scripts), I am not going to take this
> change, sorry.
> 
> Fei, please be more careful in the future.
> 
Hi Greg

Thanks for your kind reminder. I will.


> greg k-h