### [CVE-2021-47179](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-47179)
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### Description

In the Linux kernel, the following vulnerability has been resolved:NFSv4: Fix a NULL pointer dereference in pnfs_mark_matching_lsegs_return()Commit de144ff4234f changes _pnfs_return_layout() to callpnfs_mark_matching_lsegs_return() passing NULL as the structpnfs_layout_range argument. Unfortunately,pnfs_mark_matching_lsegs_return() doesn't check if we have a value herebefore dereferencing it, causing an oops.I'm able to hit this crash consistently when running connectathon basictests on NFS v4.1/v4.2 against Ontap.

### POC

#### Reference
No PoCs from references.

#### Github
- https://github.com/fkie-cad/nvd-json-data-feeds