Richard Yao a36b37d4de Fix potential NULL pointer dereference in dsl_dataset_promote_check()
If the `list_head()` returns NULL, we dereference it, right before we
check to see if it returned NULL.

We have defined two different pointers that both point to the same
thing, which are `origin_head` and `origin_ds`. Almost everything uses
`origin_ds`, so we switch them to use `origin_ds`.

We also promote `origin_ds` to a const pointer so that the compiler
verifies that nothing modifies it.

Coverity complained about this.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Neal Gompa <ngompa@datto.com>
Signed-off-by: Richard Yao <richard.yao@alumni.stonybrook.edu>
Closes #13967
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OpenZFS is an advanced file system and volume manager which was originally developed for Solaris and is now maintained by the OpenZFS community. This repository contains the code for running OpenZFS on Linux and FreeBSD.

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Official Resources

Installation

Full documentation for installing OpenZFS on your favorite operating system can be found at the Getting Started Page.

Contribute & Develop

We have a separate document with contribution guidelines.

We have a Code of Conduct.

Release

OpenZFS is released under a CDDL license. For more details see the NOTICE, LICENSE and COPYRIGHT files; UCRL-CODE-235197

Supported Kernels

  • The META file contains the officially recognized supported Linux kernel versions.
  • Supported FreeBSD versions are any supported branches and releases starting from 12.2-RELEASE.
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