CVE-2022-49167

Summary

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

btrfs: do not double complete bio on errors during compressed reads

I hit some weird panics while fixing up the error handling from btrfs_lookup_bio_sums(). Turns out the compression path will complete the bio we use if we set up any of the compression bios and then return an error, and then btrfs_submit_data_bio() will also call bio_endio() on the bio.

Fix this by making btrfs_submit_compressed_read() responsible for calling bio_endio() on the bio if there are any errors. Currently it was only doing it if we created the compression bios, otherwise it was depending on btrfs_submit_data_bio() to do the right thing. This creates the above problem, so fix up btrfs_submit_compressed_read() to always call bio_endio() in case of an error, and then simply return from btrfs_submit_data_bio() if we had to call btrfs_submit_compressed_read().

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/4a4ceb2b990771c374d85d496a1a45255dde48e3
• https://git.kernel.org/stable/c/987b5df1d10355d377315a26e7fb6c72ded83c9f
• https://git.kernel.org/stable/c/f9f15de85d74e7eef021af059ca53a15f041cdd8

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