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Subject[PATCH 5/7] ubi: Check whether the Fastmap anchor matches the super block
Date
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>
---
drivers/mtd/ubi/fastmap.c | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/drivers/mtd/ubi/fastmap.c b/drivers/mtd/ubi/fastmap.c
index 12bdb09..b66cb3e 100644
--- a/drivers/mtd/ubi/fastmap.c
+++ b/drivers/mtd/ubi/fastmap.c
@@ -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)",
--
2.7.3
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