From: NeilBrown <neilb@xxxxxxxx>
This patch has been added to the 3.18 stable tree. If you have any
objections, please let us know.
===============
[ Upstream commit HEAD ]
commit b97e92574c0bf335db1cd2ec491d8ff5cd5d0b49 upstream
Use separate bitmaps for each nodes in the cluster
bitmap_read_sb() validates the bitmap superblock that it reads in.
If it finds an inconsistency like a bad magic number or out-of-range
version number, it prints an error and returns, but it incorrectly
returns zero, so the array is still assembled with the (invalid) bitmap.
This means it could try to use a bitmap with a new version number which
it therefore does not understand.
This bug was introduced in 3.5 and fix as part of a larger patch in 4.1.
So the patch is suitable for any -stable kernel in that range.
Fixes: 27581e5ae01f ("md/bitmap: centralise allocation of bitmap file pages.")
Signed-off-by: NeilBrown <neilb@xxxxxxxx>
Reported-by: GuoQing Jiang <gqjiang@xxxxxxxx>
(cherry picked from commit ed9691677d6dda3fff331673f44d18e85938bd76)
Signed-off-by: Sasha Levin <sasha.levin@xxxxxxxxxx>
---
drivers/md/bitmap.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c
index da3604e..cced062 100644
--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -564,6 +564,8 @@ static int bitmap_read_sb(struct bitmap *bitmap)
if (err)
return err;
+ err = -EINVAL;
+
sb = kmap_atomic(sb_page);
chunksize = le32_to_cpu(sb->chunksize);
--
2.1.4
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