Re: [PATCH v2] lxc: fix lxcContainerMountAllFS() DEREF_BEFORE_CHECK

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On 9/7/23 11:04, Dmitry Frolov wrote:
> vmDef->fss[i]->src->path may be NULL,
> so check is needed before passing it to VIR_DEBUG.
> Also removed checking vmDef->fss[i]->src for NULL, since it may not be NULL.
> 
> Fixes: 57487085dc ("lxc: don't try to reference NULL when mounting filesystems")
> 
> Signed-off-by: Dmitry Frolov <frolov@xxxxxxxxx>
> ---
>  src/lxc/lxc_container.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/src/lxc/lxc_container.c b/src/lxc/lxc_container.c
> index 21220661f7..9601061b23 100644
> --- a/src/lxc/lxc_container.c
> +++ b/src/lxc/lxc_container.c
> @@ -1467,12 +1467,12 @@ static int lxcContainerMountAllFS(virDomainDef *vmDef,
>          if (STREQ(vmDef->fss[i]->dst, "/"))
>              continue;
>  
> -        VIR_DEBUG("Mounting '%s' -> '%s'", vmDef->fss[i]->src->path, vmDef->fss[i]->dst);
> +        VIR_DEBUG("Mounting '%s' -> '%s'", NULLSTR(vmDef->fss[i]->src->path), vmDef->fss[i]->dst);

Nitpick, this is long enough line that can be easily broken into two.

>  
>          if (lxcContainerResolveSymlinks(vmDef->fss[i], false) < 0)
>              return -1;
>  
> -        if (!(vmDef->fss[i]->src && vmDef->fss[i]->src->path &&
> +        if (!(vmDef->fss[i]->src->path &&
>                STRPREFIX(vmDef->fss[i]->src->path, vmDef->fss[i]->dst)) &&
>              lxcContainerUnmountSubtree(vmDef->fss[i]->dst, false) < 0)
>              return -1;

Reviewed-by: Michal Privoznik <mprivozn@xxxxxxxxxx>

and pushed.

Michal




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