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authorAndrei Vagin <avagin@google.com>2021-01-05 09:45:27 -0800
committergVisor bot <gvisor-bot@google.com>2021-01-05 09:47:30 -0800
commit2a200811d4c95e1c84d2bdd56068f02d46ebc524 (patch)
tree7b9de79aadc2173717747e40c9022737bc00d4d4 /pkg
parent807a080d9574e42dae83bb8bd0863b110b98a858 (diff)
fs/fuse: check that a task has a specified file descriptor
Reported-by: syzbot+814105309d2ae8651084@syzkaller.appspotmail.com PiperOrigin-RevId: 350159452
Diffstat (limited to 'pkg')
-rw-r--r--pkg/sentry/fsimpl/fuse/fusefs.go3
1 files changed, 3 insertions, 0 deletions
diff --git a/pkg/sentry/fsimpl/fuse/fusefs.go b/pkg/sentry/fsimpl/fuse/fusefs.go
index 3af807a21..204d8d143 100644
--- a/pkg/sentry/fsimpl/fuse/fusefs.go
+++ b/pkg/sentry/fsimpl/fuse/fusefs.go
@@ -129,6 +129,9 @@ func (fsType FilesystemType) GetFilesystem(ctx context.Context, vfsObj *vfs.Virt
return nil, nil, syserror.EINVAL
}
fuseFDGeneric := kernelTask.GetFileVFS2(int32(deviceDescriptor))
+ if fuseFDGeneric == nil {
+ return nil, nil, syserror.EINVAL
+ }
defer fuseFDGeneric.DecRef(ctx)
fuseFD, ok := fuseFDGeneric.Impl().(*DeviceFD)
if !ok {