Richard Yao 5f73bbba43 Do not pass -1 to strerror() from zfs_send_cb_impl()
`zfs_send_cb_impl()` calls `dump_filesystems()`, which calls
`dump_filesystem()`, which will return `-1` as an error when
`zfs_open()` returns `NULL`.

This will be passed to `zfs_standard_error()`, which passes it to
`zfs_standard_error_fmt()`, which passes it to `strerror()`.

To fix this, we modify zfs_open() to set `errno` whenever it returns
NULL. Most of the cases already have `errno` set (since they pass it to
`zfs_standard_error_fmt()`, which makes this easy. Then we modify
`dump_filesystem()` to pass `errno` instead of `-1`.

Reported-by: Coverity (CID-1524598)
Reviewed-by: Damian Szuberski <szuberskidamian@gmail.com>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Richard Yao <richard.yao@alumni.stonybrook.edu>
Closes #14264
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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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