CVE-2022-50293

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

btrfs: do not BUG_ON() on ENOMEM when dropping extent items for a range

If we get -ENOMEM while dropping file extent items in a given range, at

btrfs_drop_extents(), due to failure to allocate memory when attempting to

increment the reference count for an extent or drop the reference count,

we handle it with a BUG_ON(). This is excessive, instead we can simply

abort the transaction and return the error to the caller. In fact most

callers of btrfs_drop_extents(), directly or indirectly, already abort

the transaction if btrfs_drop_extents() returns any error.

Also, we already have error paths at btrfs_drop_extents() that may return

-ENOMEM and in those cases we abort the transaction, like for example

anything that changes the b+tree may return -ENOMEM due to a failure to

allocate a new extent buffer when COWing an existing extent buffer, such

as a call to btrfs_duplicate_item() for example.

So replace the BUG_ON() ca

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References