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

btrfs: add a sanity check for btrfs root in btrfs_search_slot()

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().

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Linux kernel 代码问题漏洞

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在代码问题漏洞，该漏洞源于Btrfs文件系统在btrfs_search_slot函数中未对btrfs根进行空指针检查，当使用rescue=ibadroots参数且extent树根损坏时，可能导致空指针解引用，影响文件系统的稳定性和可靠性。

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