CVE-2022-50379

Description

In the Linux kernel, the following vulnerability has been resolved: btrfs: fix race between quota enable and quota rescan ioctl When enabling quotas, at btrfs_quota_enable(), after committing the transaction, we change fs_info->quota_root to point to the quota root we created and set BTRFS_FS_QUOTA_ENABLED at fs_info->flags. Then we try to start the qgroup rescan worker, first by initializing it with a call to qgroup_rescan_init() - however if that fails we end up freeing the quota root but we leave fs_info->quota_root still pointing to it, this can later result in a use-after-free somewhere else. We have previously set the flags BTRFS_FS_QUOTA_ENABLED and BTRFS_QGROUP_STATUS_FLAG_ON, so we can only fail with -EINPROGRESS at btrfs_quota_enable(), which is possible if someone already called the quota rescan ioctl, and therefore started the rescan worker. So fix this by ignoring an -EINPROGRESS and asserting we can't get any other error.

PUBLISHED Reserved 2025-09-17 | Published 2025-09-18 | Updated 2025-09-18 | Assigner Linux

Product status

References

git.kernel.org/...c/c97f6d528c3f1c83a6b792a8a7928c236c80b8fe

git.kernel.org/...c/26b7c0ac49a3eea15559c9d84863736a6d1164b4

git.kernel.org/...c/47b5ffe86332af95f0f52be0a63d4da7c2b37b55

git.kernel.org/...c/4b996a3014ef014af8f97b60c35f5289210a4720

git.kernel.org/...c/0efd9dfc00d677a1d0929319a6103cb2dfc41c22

git.kernel.org/...c/6c22f86dd221eba0c7af645b1af73dcbc04ee27b

git.kernel.org/...c/331cd9461412e103d07595a10289de90004ac890

cve.org (CVE-2022-50379)

nvd.nist.gov (CVE-2022-50379)

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