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ubi: Check whether the Fastmap anchor matches the super block

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This helps to detect cases where an user copies an UBI image to
another target with different bad blocks.

Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Richard Weinberger 2016-06-14 10:12:16 +02:00
parent fdf10ed710
commit 5283ec72b0
1 changed files with 7 additions and 0 deletions
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7
drivers/mtd/ubi/fastmap.c
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@ -975,6 +975,13 @@ int ubi_scan_fastmap(struct ubi_device *ubi, struct ubi_attach_info *ai,
goto free_hdr;
}
if (i == 0 && pnum != fm_anchor) {
ubi_err(ubi, "Fastmap anchor PEB mismatch: PEB: %i vs. %i",
pnum, fm_anchor);
ret = UBI_BAD_FASTMAP;
goto free_hdr;
}
ret = ubi_io_read_ec_hdr(ubi, pnum, ech, 0);
if (ret && ret != UBI_IO_BITFLIPS) {
ubi_err(ubi, "unable to read fastmap block# %i EC (PEB: %i)",