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- From b88a82e78cdd0ab8e0339c1c3f9564c4d8c0c969 Mon Sep 17 00:00:00 2001
- From: Daniel Axtens <dja@axtens.net>
- Date: Mon, 18 Jan 2021 17:17:16 +1100
- Subject: [PATCH] fs/btrfs: Validate the number of stripes/parities in RAID5/6
- This prevents a divide by zero if nstripes == nparities, and
- also prevents propagation of invalid values if nstripes ends up
- less than nparities.
- Signed-off-by: Daniel Axtens <dja@axtens.net>
- Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
- Signed-off-by: Stefan Sørensen <stefan.sorensen@spectralink.com>
- ---
- grub-core/fs/btrfs.c | 3 +++
- 1 file changed, 3 insertions(+)
- diff --git a/grub-core/fs/btrfs.c b/grub-core/fs/btrfs.c
- index 2b65bd5..e4e87ba 100644
- --- a/grub-core/fs/btrfs.c
- +++ b/grub-core/fs/btrfs.c
- @@ -1076,6 +1076,9 @@ grub_btrfs_read_logical (struct grub_btrfs_data *data, grub_disk_addr_t addr,
- * stripen is computed without the parities
- * (0 for A0, A1, A2, 1 for B0, B1, B2, etc.).
- */
- + if (nparities >= nstripes)
- + return grub_error (GRUB_ERR_BAD_FS,
- + "invalid RAID5/6: nparities >= nstripes");
- high = grub_divmod64 (stripe_nr, nstripes - nparities, &stripen);
-
- /*
- --
- 2.14.2
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