CVE-2024-56774: btrfs: add a sanity check for btrfs root in btrfs_search_slot()

First published: Wed Jan 08 2025(Updated: )

In the Linux kernel, the following vulnerability has been resolved: btrfs: add a sanity check for btrfs root in btrfs_search_slot() Syzbot reports a null-ptr-deref in btrfs_search_slot(). The reproducer is using rescue=ibadroots, and the extent tree root is corrupted thus the extent tree is NULL. When scrub tries to search the extent tree to gather the needed extent info, btrfs_search_slot() doesn't check if the target root is NULL or not, resulting the null-ptr-deref. Add sanity check for btrfs root before using it in btrfs_search_slot().

Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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