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fs/btrfs: Validate the number of stripes/parities in RAID5/6

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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>
This commit is contained in:
Daniel Axtens 2021-01-18 17:17:16 +11:00 committed by Daniel Kiper
parent e18a000738
commit b88a82e78c
1 changed files with 3 additions and 0 deletions
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3
grub-core/fs/btrfs.c
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@ -1083,6 +1083,9 @@ 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);
/*