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authorRichard Weinberger <richard@nod.at>2016-06-14 10:12:16 +0200
committerRichard Weinberger <richard@nod.at>2016-07-29 23:32:43 +0200
commit5283ec72b0cca44ccea63070f6954fd8675b9ac4 (patch)
tree61705317853d1d51a6de1b6a83f5f43ef43b75c7 /drivers/mtd/ubi
parentfdf10ed710c0aa177e8dfcd84e65e4e5e8e0956b (diff)
ubi: Check whether the Fastmap anchor matches the super block
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>
Diffstat (limited to 'drivers/mtd/ubi')
-rw-r--r--drivers/mtd/ubi/fastmap.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/mtd/ubi/fastmap.c b/drivers/mtd/ubi/fastmap.c
index 12bdb0902327..b66cb3e2a5f0 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)",