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Re: [PATCH FOR 6.8.0] libxl: Don't free def member of virDomainObj



On Thu, Sep 24, 2020 at 1:03 PM Jim Fehlig <jfehlig suse com> wrote:
>
> The refactoring in commit de49d5bad3 accidentally dropped the statement
> setting def to NULL after successfully adding it to the virDomainObjList,
> causing it to be freed while still in use. The resulting memory
> corruption caused unpredictable behavior, often resulting in a libvirtd
> crash.
>
> Signed-off-by: Jim Fehlig <jfehlig suse com>
> ---
>
> Unpredictable is an understatement! When running monolithic libvirtd with
> both qemu and xen drviers enabled, qemu crashed while initializing. Recall
> it is initialized after xen.
>
> Thread 17 "daemon-init" received signal SIGSEGV, Segmentation fault.
> #0  0x00007f32e5fbe9e3 in _int_malloc () at /lib64/libc.so.6
> #1  0x00007f32e5fbf6e0 in _int_realloc () at /lib64/libc.so.6
> #2  0x00007f32e5fc0729 in realloc () at /lib64/libc.so.6
> #3  0x00007f32e6dc21b8 in g_realloc () at /usr/lib64/libglib-2.0.so.0
> #4  0x00007f32e7532090 in virReallocN (ptrptr=0x7f329affcad8, size=1, count=1403)
>     at ../src/util/viralloc.c:91
> #5  0x00007f32e75530c7 in virCommandProcessIO (cmd=0x7f328807ff40) at ../src/util/vircommand.c:2271
> #6  0x00007f32e7553a6a in virCommandRun (cmd=0x7f328807ff40, exitstatus=0x0)
>     at ../src/util/vircommand.c:2451
> #7  0x00007f32e75dde73 in virSysinfoReadDMI () at ../src/util/virsysinfo.c:1237
> #8  0x00007f32e75de0cb in virSysinfoRead () at ../src/util/virsysinfo.c:1294
> #9  0x00007f32a240b69d in qemuStateInitialize
>     (privileged=true, root=0x0, callback=0x56453a0b3e97 <daemonInhibitCallback>, opaque=0x56453b000030) at ../src/qemu/qemu_driver.c:658
> #10 0x00007f32e7832350 in virStateInitialize
>     (privileged=true, mandatory=false, root=0x0, callback=0x56453a0b3e97 <daemonInhibitCallback>, opaque=0x56453b000030) at ../src/libvirt.c:656
> #11 0x000056453a0b4175 in daemonRunStateInit (opaque=0x56453b000030)
>     at ../src/remote/remote_daemon.c:596
>
>  src/libxl/libxl_driver.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/src/libxl/libxl_driver.c b/src/libxl/libxl_driver.c
> index 083738871d..571b70f982 100644
> --- a/src/libxl/libxl_driver.c
> +++ b/src/libxl/libxl_driver.c
> @@ -627,6 +627,7 @@ libxlAddDom0(libxlDriverPrivatePtr driver)
>                                         NULL)))
>              goto cleanup;
>
> +        def = NULL;
>          vm->persistent = 1;
>          virDomainObjSetState(vm, VIR_DOMAIN_RUNNING, VIR_DOMAIN_RUNNING_BOOTED);
>      }
> --
> 2.28.0
>
>

Reviewed-by: Neal Gompa <ngompa13 gmail com>


-- 
真実はいつも一つ!/ Always, there's only one truth!



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